Bring 4 cups water and the jalapenos to a simmer. Remove from the heat and let steep for 15 minutes, then drain, let cool and pour over the watermelon in a bowl.
Before serving, drain the watermelon on paper towels and move onto a platter. Drizzle the strawberry vinegar reduction over and add the feta cheese, mint, parsley and basil. Season with black pepper, if desired.