4 ears grilled corn
1 pound edamame, cooked and shelled
2 1/2 cups cooked black-eyed peas (if using canned, be sure to drain)
1 red onion, finely chopped
4 stalks celery, finely chopped
4 tablespoons melted butter or 2 tablespoons olive oil
1 1/2 cups balsamic vinaigrette, or as needed
2 cloves garlic, minced
Kosher salt and freshly ground black pepper
1 large head red leaf lettuce, torn into bite size pieces
1 (12-ounce) bag baby spinach
Sliced plum tomatoes, for garnish