Grilled Salmon with Avocado Greek Salsa and Orzo

dry orzo

skinless salmon fillets

olive oil (, divided, plus more for brushing grill)

Salt and freshly ground black pepper

small Roma tomatoes (, diced (1 cup))

of a cucumber (, peeled and chopped (1 cup))

chopped red onions

chopped kalamata olives

garlic cloves (, minced (2 tsp))

medium avocado (, peeled and diced)

crumbled feta ((2.5 oz))

fresh lemon juice

finely minced fresh parsley

finely minced fresh oregano