Ninja Slushi Watermelon Malibu Slushie Recipe

Malibu Watermelon Rum adds a sweet, fruity flavor to a cold cocktail, with a tropical taste that makes it even more refreshing.

I like how this rum pairs with watermelon juice to create a drink that tastes bright and fruity without needing too many extra ingredients.

The Ninja Slushi takes this simple drink a step further by turning the liquid mixture into a smooth, frozen slushie. Instead of serving a regular mixed cocktail over ice, you get a thick, icy texture in every sip.

My homemade Ninja Slushi Malibu Watermelon Slushie Recipe brings the watermelon and rum flavors together in one chilled drink. Below, you’ll find the ingredients, exact measurements, and machine settings needed to make this fruity frozen cocktail at home.

Which Malibu Rum Is Best for This Recipe

Malibu Original Coconut Rum is my first choice for this watermelon slushie. Its sweet coconut flavor pairs well with watermelon juice and fresh lime. You can also use Malibu Watermelon Rum for a more pronounced watermelon flavor while keeping the rest of the recipe the same.

I also add white or silver rum to give the drink a stronger kick without overpowering the fruit. Its clean flavor complements the coconut rum and watermelon juice.

Since alcohol affects how well the mixture freezes, measure both rums carefully to help your Ninja SLUSHi achieve a thick, scoopable consistency.

Ingredients for Ninja Slushi Malibu Watermelon Slushie

The ingredients for this Ninja Slushi Malibu Watermelon Slushie Recipe are simple and easy to find at most grocery stores.

• 5 cups Simply Watermelon juice – Sweet, light, and bright pink, it makes up most of the drink and gives it that fresh summer taste. Bottled juice keeps the flavor steady every time. Swap it with fresh juice blended from seedless slices and strained well.

• ¾ cup Malibu Original Coconut Rum – Adds a sweet coconut flavor that complements the watermelon juice and fresh lime. For a stronger watermelon profile, substitute Malibu Watermelon Rum in the same quantity.

• ¾ cup white or silver rum – Clean and light, it adds extra kick without covering the fruit. Too much makes the slush soft, so measure carefully. Swap it with vodka for the same strength, or use blanco tequila if you like a slightly earthy edge.

• ¼ cup freshly squeezed lime juice – Bright, sharp, and a little tangy, it keeps the drink from tasting too sweet. Squeeze it right before mixing for the best flavor. Swap it with bottled juice in a pinch, though the taste is flatter, or use fresh lemon juice for a milder tang.

• 1 cup water – Cold and plain, it thins the mix just enough so the drink freezes into soft, scoopable slush instead of a hard block. It also keeps the total under the machine’s limit. Swap it with chilled coconut water for a mild island taste, though it adds a little sweetness.

Kitchen Equipment

1. Ninja Slushi machine
2. Large liquid measuring cup
3. Citrus juicer or reamer
4. Small strainer
5. Tall glasses
6. Paring knife and cutting board
7. Long spoon

How to Make a Ninja Slushi Malibu Watermelon Slushie at Home

Just focus on getting the setup and measurements right and follow these steps to make a cold, fruity slushie with a thick, icy texture.

1. Set Up Your Ninja SLUSHi

Place your Ninja SLUSHi on a flat, stable countertop. Make sure all removable parts are clean, then assemble the vessel, auger, condensation catch, and drip tray according to the manufacturer’s instructions.

Secure the vessel in place and check that all components are properly fitted before plugging in the machine.

2. Pour the Liquids Into the Vessel

Open the cover on top of the vessel. Pour in 5 cups of Simply Watermelon juice, ¾ cup of Malibu coconut rum, ¾ cup of white or silver rum, ¼ cup of fresh lime juice, and 1 cup of water. Close the cover before starting the machine.

The mixture should look like a thin, pink drink at this point. That is normal. The machine will freeze it as it runs. The total is about 62 fluid ounces, which stays below the 64-ounce limit. Do not add extra liquid, ice, or pieces of fresh watermelon to the vessel.

3. Select the Spiked Slush Setting

Press the power button and choose the Spiked Slush preset. This setting is made for drinks that contain alcohol. The machine will begin cooling the mixture, and the temperature lights will pulse as it works toward the selected temperature.

Freezing can take about 15 – 45 minutes, depending on the starting temperature, ingredients, and amount of liquid. Wait until the temperature lights stay solid and the machine beeps.

The drink should have a thick, icy texture that can flow through the dispenser. Avoid adding extra rum, as too much alcohol can keep the mixture from freezing well.

4. Dispense the Slushie and Add a Watermelon Wedge

Place a glass on the drip tray under the handle. Slowly pull the handle toward you to fill the glass, then release it to stop the flow.

The slushie should look pink and icy, with a texture that is thicker than a regular mixed drink.

Cut a small slit in a fresh watermelon wedge and place it on the rim of the glass. Serve the drink while it is cold.

My Tips for a Thick, Smooth Watermelon Slushie

The recipe needs very little attention because the machine does all the work. Still, a few small adjustments make the slush thicker, smoother, and better tasting every time.

1. Shake the Juice Bottle: Give the watermelon juice a good shake before measuring if the label recommends it. This helps mix any settled pulp or juice solids. The result is a more even flavor from the first glass to the last.

2. Adjust the Temperature: The preset starts at its default temperature, but you can adjust it to suit your taste. If the slushie is too soft, lower the temperature a little. If it is too thick to pour, raise it one level and wait for the texture to change.

3. Chill Your Glasses: Place your serving glasses in the freezer for about 15 minutes before pouring. Cold glasses help slow melting, so the slushie stays icy longer. Avoid leaving thin glassware in the freezer if it is not made for cold temperatures.

4. Wipe the Drip Tray: Watermelon juice and rum can leave sticky drops around the dispenser. Wipe the drip tray after serving, then clean the removable parts as directed in your machine’s guide. This makes cleanup easier and helps keep the next drink fresh.

How to Serve a Malibu Watermelon Slushie

I like to keep the serving simple so the pink color and watermelon taste get the attention. A cold glass and a fresh fruit garnish are all you need, but a few small touches can make each glass look nice.

• Add a watermelon wedge: Cut a small slit in a fresh watermelon wedge and place it on the rim. This gives each drink a clear fruit garnish that matches the flavor inside.
• Use a lime wedge: Add a lime wedge to the rim for a fresh citrus smell. You can also squeeze a little lime into your glass if you prefer a sharper taste.
• Pair it with light snacks: Serve the slushie with chips and fresh salsa, grilled shrimp, or a plate of cut fruit. These foods work well alongside a cold watermelon cocktail without taking over its sweet fruit taste.

Malibu Watermelon Slushie Variations

Malibu Coconut Rum Slushie – Swap the white rum for another ¾ cup of Malibu coconut rum. Keep the juice, lime juice, and water the same.

Pour everything into the machine, choose Spiked Slush, and wait for the beep. The slush tastes creamier, with a stronger tropical note.

Malibu Watermelon Lemonade Slushie – Replace the water and lime juice with 1¼ cups of chilled lemonade. Keep both rums and all the watermelon juice.

Pour everything in, choose Spiked Slush, and wait for the beep. Lemonade adds more sweetness, so taste a spoonful of the finished slush before serving.

Strawberry Watermelon Malibu Slushie – Blend 1 cup chopped strawberries with ½ cup watermelon juice until smooth, then strain out the seeds. Stir 1 cup of that puree into 4 cups of juice, plus both rums, the lime juice, and the water.

Pour into the machine, choose Spiked Slush, and wait for the beep.

Ninja Slushi Malibu Watermelon Slushie Recipe FAQs

1. How strong is this slushie?

It’s lighter than a standard cocktail because the juice and water spread out the rum across many servings. Even so, the cold temperature makes it easy to sip fast, so pour slowly and drink responsibly. Smaller glasses help you keep track of how much you’ve had.

2. Why is my slushie too runny?

Check your ingredient measurements and adjust the temperature according to your Ninja SLUSHi’s instructions. Too much alcohol can prevent the mixture from freezing properly, so make sure you have measured both rums accurately before starting the machine.

3. Why is my slushie too icy or hard to pour?

The temperature setting may be too cold for your mix. Raise it one level and let the machine run for a few minutes. Stir gently with the handle open if needed. A cup of cold water added next time will also loosen the texture.

4. Can I add a salted rim?

Yes, and I recommend it. Rub a lime wedge around the rim of a chilled glass, then press it into coarse salt or a chili-lime seasoning. The salty edge makes the sweet watermelon taste even brighter with each sip.

5. What’s the best glass to serve this in?

A chilled rocks glass or a stemless wine glass works well. Tall hurricane glasses look nice but melt faster because there’s more surface area. Whatever you use, freeze it first.

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Yield: 8

Ninja SLUSHi Malibu Watermelon Slushie Recipe

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Make this Ninja Slushi Malibu Watermelon Slushie Recipe in 35 minutes with watermelon juice, Malibu rum, fresh lime, and a smooth frozen texture.

Prep Time: 5 minutes

Slush Time: 30 minutes

Total Time: 35 minutes

Ingredients

• 5 cups Simply Watermelon juice
• ¾ cup Malibu Original Coconut Rum
• ¾ cup white or silver rum
• ¼ cup freshly squeezed lime juice
• 1 cup cold water
• 1 small fresh watermelon wedge, for garnish (optional)

Instructions

1. Set Up the Ninja SLUSHi - Place the machine on a flat, stable counter. Clean and assemble the vessel, auger, condensation catch, and drip tray according to the manufacturer's instructions.
2. Add the Ingredients - Pour 5 cups watermelon juice, ¾ cup Malibu rum, ¾ cup white rum, ¼ cup lime juice, and 1 cup cold water into the vessel. Close the lid. The total liquid is about 62 ounces, below the 64-ounce limit.
3. Select Spiked Slush - Turn on the machine and select the Spiked Slush setting. Let it run for about 15–60 minutes, until the temperature lights stay solid and the machine beeps. Avoid adding extra alcohol, as it can prevent proper freezing.
4. Serve the Slushie - Place a glass under the dispenser and pull the handle to fill it. Garnish with a fresh watermelon wedge and serve cold. Keep the machine running on the selected setting while serving the remaining slushie.

Nutrition Information

Serving Size per serving
Amount Per ServingCalories 165Sodium 12mgCarbohydrates 15gSugar 14gSugar Alcohols 12g