shrimp and rice recipe

1 onion, finely chopped 4 garlic cloves, crushed 2½ cups white rice (jasmine, basmati, or arborio) ½ cup white wine (optional) 400g (14 oz) crushed tomatoes 4 cups chicken or fish stock 1 cup frozen peas 1 pound large shrimp, peeled and deveined Olive oil Salt and pepper to taste Fresh parsley and lemon slices for garnish