Optional Flavor Enhancing Step - Quick Roast Tomatoes:
Preheat oven to 400°F. Layer tomatoes (cut side up) in a baking tray. Drizzle with olive oil and season with salt & ground black pepper. If your tomatoes are not in season, sprinkle a little sugar on the tomatoes to help them caramelize better. Place baking tray in the oven’s middle rack. Depending on your oven and tomatoes, it will take 45 - 65 minutes.
*Note: This step maximizes the flavor of your tomatoes. If you don’t want to turn on the oven, another option is to brown the tomatoes (cut side down) with olive oil in the Instant Pot on Sauté More for 4 - 5 minutes. Set aside on a large bowl.