Start to finish: 30 minutes (20 minutes active)
Servings: 4

1/2 red bell pepper, diced
1/2 pound ripe tomatoes (about 2 medium tomatoes), diced
4-inch piece English cucumber, diced
Kosher salt
1/2 clove garlic, smashed
1 tablespoon sherry vinegar
Ground black pepper
2 tablespoons extra-virgin olive oil
Four 6- to 8-ounce pieces center-cut salmon or arctic char fillets, skin on
Olive oil cooking spray
Chopped fresh herbs (such as basil, chives, tarragon, cilantro or parsley), to garnish (optional)