How to Make It
To prepare vinaigrette, whisk together first 8 ingredients in a bowl.
To prepare snap peas, heat a grill pan over high heat.
Combine peas, 1 1/2 tablespoons olive oil, and 1/4 teaspoon black pepper in a bowl; toss. Add peas to pan; grill 2 minutes. Turn peas; grill 1 minute or until outsides begin to blister.
Transfer peas to a large bowl. Add tomatoes, red onion, serrano, basil, and vinaigrette to bowl; toss to coat well. Sprinkle with cashews.