
Sweet, juicy watermelon and bright fresh lemon juice come together in a drink that tastes like pure summer in a glass. The blended watermelon gets strained through a fine-mesh sieve, leaving you with a silky, vibrant juice that mixes beautifully with the homemade simple syrup and cold water. Every single ingredient here is straightforward and naturally free from tree nuts of any kind, so you can serve this at a backyard gathering or kids' party without a second thought. The homemade simple syrup takes just a few minutes on the stovetop and gives you full control over the sweetness — no mystery additives, no store-bought shortcuts needed. Poured over ice and finished with a sprig of fresh mint and a lemon slice, it looks as good as it tastes. This is the kind of refreshing, crowd-pleasing drink that disappears fast, so you may want to double the batch.
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Combine the sugar and 1/2 cup water in a small saucepan over medium heat, stirring until the sugar is fully dissolved, about 3–4 minutes. Remove from the heat and let the syrup cool for 10 minutes.
Add the watermelon cubes to a blender and blend on high until completely smooth, about 30–45 seconds.
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