This is a multi-step meal, but actually pretty easy to make. If you want to, you can grill the watermelon slices too-brush lightly with oil and grill about 2 minutes per side. Spicy Shrimp over Watermelon & Cucumber Salad First, preheat grill over high. If using wooden skewers, soak in water. Quick-Pickled Sweet Onions 1 large sweet onion (such as Vidalia), very thinly sliced into rings 3/4 cup white wine or rice vinegar 2 teaspoons salt 3 tablespoons sugar 1 cup hot water Put onions in a 1-quart jar or glass container. Whisk together the vinegar, salt, and sugar into the hot water until sugar/salt dissolves. Pour vinegar mixture over the onions, make sure all onion slices are submerged, and cover jar tightly. Refrigerate for 30 minutes (will keep for up to 1 week in the refrigerator). Grilled Spicy Shrimp 1 lb. shrimp, peeled and deveined, patted ry 2 teaspoons sugar 2 teaspoons ground coriander 1/4 teaspoon cayenne pepper 1 tablespoon ext