Mince garlic; chop onion, bell pepper, carrot and zucchini; dice tomato.: The first scents you will notice are bright and vegetal as the fresh garlic and onion release their aroma while you chop, the air filling with a promising savory perfume. Good knife work ensures even cooking, so aim for consistent sizes so no single vegetable overcooks. A common mistake here is uneven chopping which causes some pieces to become limp while others stay raw, so take a moment to size-match pieces. Keep a small bowl to collect scraps to keep your workspace tidy and to prevent missing any piece that should go in the pot later.
Heat oil in your Instant pot on saute mode. Once hot, add onion and garlic. Cook for 2 minutes, stirring occasionally. Add ground beef or turkey and saute until mostly cooked.: As the olive oil shimmers, it will carry the fragrance of the onion and garlic outward, and you should hear a gentle sizzle when they hit the surface. The sound will deepen when you add the ground beef or turkey , and you want to achieve browning that adds caramelized notes. Browning develops complex flavor through the Maillard reaction, which is vital for a lasagna style base. Avoid overcrowding the pot which traps steam and prevents browning, a frequent misstep. If the meat steams instead of browns, lift it out briefly and give the pot a quick scrape to encourage fond formation, that browned residue contains concentrated flavor.
Add bell pepper, carrot and zucchini; stir together. Add red lentils, tomato, Italian seasoning, salt, onion powder, garlic powder and tomato paste; whisk together while pouring in broth.: As you fold in the chopped vegetables they will hiss and briefly pop, releasing sweeter and greener notes; the tomato paste will darken and deepen as you whisk, creating a thick ribbon of concentrated tomato. Pouring the vegetable broth deglazes the pot, lifting browned bits off the bottom into the liquid, which is essential for a rich soup. This integration adds body and harmonizes flavors quickly. A common mistake is dumping broth too rapidly which can cause splatter or uneven incorporation; pour steadily while whisking to emulsify the paste. If you notice clumps of paste, take a moment to whisk until smooth so the texture of the soup remains silky.
Break lasagna noodles into small pieces and add to Instant Pot; stir to combine.: When you break the lasagna noodles into the pot, they will initially float and then soften as they hydrate, releasing a faint toasted pasta scent. Stirring helps prevent clumping and ensures each piece submerges to cook evenly. The broken noodle pieces will impart a comforting thickness as they release starch while cooking. A common error is not breaking noodles small enough which leads to long strands that can tangle, so aim for two to three inch pieces. If the noodles seem to stick together, gently separate them with a spoon to ensure an even texture throughout the soup.
Close the lid and set to high pressure cook for 3 minutes. Let the pressure release naturally for 10 minutes, then carefully do a quick release if there is still pressure in the pot.: During pressure cooking you will notice the pot going quiet as flavors concentrate, the steam carrying rich tomato and meat aromas. The short high pressure burst is enough to tenderize the pasta and meld flavors quickly while keeping textures lively. Natural release allows residual heat to finish cooking gently, preventing an overcooked, mushy pasta. A common mistake is performing an immediate quick release which can agitate the soup and overcook delicate pieces, so always wait the recommended natural release before finishing with a quick release if needed. Use oven mitts and a long utensil for safety when venting.
Mix in the black pepper, red pepper flakes, and nutritional yeast. Taste and adjust seasonings, if desired.: At this stage the aroma will be rounded and savory, and when you stir in black pepper and red pepper flakes a gentle warmth will bloom. Nutritional yeast adds a savory, slightly cheesy lift that complements the meat and tomato. Tasting now is crucial because heat concentrates flavors; adjust salt and heat sparingly. A frequent slip is over-salting early, so taste before adding more salt or spices. If it tastes flat, a splash more broth or a pinch of salt can brighten it quickly.
Fold in the spinach and sprinkle shredded mozzarella over the top; let it sit for a few minutes to allow the spinach to wilt and the cheese to melt. Serve with grapes.: When you fold in the handful of spinach it will instantly wilt into glossy, tender ribbons, offering a fresh green contrast. The shredded mozzarella cheese melts slowly into creamy pockets, pulling gentle strings when scooped. Letting the bowl rest gives the textures a chance to settle and flavors to marry. A common mistake is stirring vigorously after adding cheese which can break the silkiness, so allow it to sit undisturbed for a couple minutes. Serve alongside the crisp grapes for a juicy, sweet counterpoint that refreshes the palate after rich bites.