My spicy watermelon lime syrup is one of those recipes that tastes like something you’d find at a specialty cocktail bar, yet it’s surprisingly easy to make at home. Watermelon juice, fresh lime, Fresno peppers, and sugar simmer together into a vibrant, sweet-and-spicy syrup that’s perfect for mocktails, cocktails, sparkling water, desserts, pancakes, waffles, and more.
A Note From Kristen
I made this for the first time when I had half a watermelon sitting on my counter and a bag of Fresno peppers I kept meaning to use. I blended the watermelon, threw everything in a pot, and let it go low and slow while I did other things. By the time I strained it and tasted it, I was immediately trying to figure out what else I could put it on. So tasty! I’ve since made it with store-bought juice, and it works just as beautifully. Keep a jar in the fridge and you’ll find a reason to use it every day. Enjoy!
~Kristen
Key Ingredient Notes
A few quick notes on the ingredients that matter most. Find the full ingredient list and instructions in the recipe card below.
How to Use Watermelon Syrup
- Stir into sparkling water or lemonade for an instant agua fresca.
- Use as a cocktail mixer with tequila, mezcal, or vodka.
- Drizzle over vanilla ice cream, cheesecake, or mango sorbet.
- Spoon over yogurt or a cheese board.
- Use to rim margarita or mocktail glasses.
Kristen’s Top Tips
- Keep the heat low and let it simmer slowly. Rushing it risks scorching the sugar.
- Steep the peppers off heat for the full 10 minutes before straining for the best flavor.
- This simple syrup will look thin when hot. Let it cool completely before deciding if it needs more time on the stove. It thickens as it cools!
- Zest your limes before juicing (much easier that way!).
More Delicious Syrup Recipes You Might Enjoy
Spicy Watermelon Lime Syrup
Ingredients
- 4 cups watermelon juice store-bought or blended and strained fresh watermelon; see notes below
- ½ cup granulated white sugar coconut sugar or brown sugar can be used but the color will be different
- Zest of 2 limes
- 4 tablespoons fresh lime juice
- 2 fresh Fresno peppers thinly sliced
- Pinch salt
Method
- Add the watermelon juice, sugar, lime zest, lime juice, peppers, and salt to a saucepan. Bring to a gentle simmer, over medium-low heat.
- Simmer for 30–40 minutes, stirring occasionally, until reduced by about half and noticeably syrupy.
- Remove from the heat and steep for 10 minutes. Strain. Cool completely (it will thicken as it cools).
- Store in the refrigerator for up to 10 days or enjoy right away!
Notes
Nutrition
Nutritional information is automatically calculated using a third-party calculator and is an estimate only.
