Keto Instant Pot Greek Cauliflower Rice

Name: Keto Instant Pot Greek Cauliflower Rice
Cuisine: Mediterranean, Greek
Ingredients: 1 small head cauliflower, trimmed and cut into quarters; 2 tablespoons olive oil, divided; ½ cup diced red onion; 1 tablespoon minced garlic; 1 cup halved grape tomatoes; ½ cup chopped English cucumber; ½ cup halved kalamata olives; ½ cup crumbled feta cheese; ¼ cup chopped fresh parsley; Grated zest and juice of 1 lemon; ¼ teaspoon fine sea salt; ¼ teaspoon black pepper; ¼ cup chopped walnuts, toasted if desired