Cauliflower Rice Bowl with Garlic Shrimp

Name: Cauliflower Rice Bowl with Garlic Shrimp
Ingredients: 1/4 cup olive oil, divided; 1/4 cup chopped red onion; 3 cups frozen cauliflower rice, store-bought or homemade; 1/4 cup lemon juice, divided; 1/4 teaspoon salt; 1/8 teaspoon ground black pepper; Finely grated zest of 1/2 lemon; 2 handfuls baby spinach leaves (about 2 cups, packed); 8 cherry cherry tomatoes, halved, or quartered if large; 2 tablespoons chopped parsley; 1 clove garlic, peeled and thinly sliced; 8 to 10 extra-large shrimp, peeled and deveined; 1/2 teaspoon paprika; 1/2 avocado , sliced, for garnish