For a spicier kick, leave some of the jalapeño seeds intact. If you prefer a sweeter salad, a drizzle of honey or maple syrup to the watermelon can add a nice dimension. The warmth of the scallion mixture is key to unlocking the watermelon's sweetness. Don't skip this step! For visual appeal, garnish with a few extra slices of jalapeño and a sprig of parsley or mint.