Watermelon is the perfect ingredient for a sweeter-style salsa. The two star ingredients in this salsa, though, are really the spicy Padrón pepper and the mint. The pepper adds a nice punch and the mint gives it complexity and pairs so well with sweet watermelon. Most Padrón peppers fall on the mild and sweet side but not all. The ones I picked up at the farmers’ market this morning were definitely spicy. And a little heat is what this salsa needs.