Trim off the rind of a baby seedless watermelon, then slice as thin as possible. Arrange on a platter, overlapping slightly. Whisk 2 tablespoons each white wine vinegar and olive oil with 1/2 teaspoon honey and 1/2 minced red jalapeño; drizzle on the watermelon and sprinkle with flaky sea salt. Let sit 20 minutes. Top with shaved ricotta salata and fresh mint.