Gather all your ingredients and prep them: mince the garlic, dice the onion and bell peppers, and have your ground beef, and ground beef liver ready (liver cubes from frozen can be used).
Heat a large pot over medium-high heat.
Add a splash of oil to the pot, then add the minced garlic, diced onion, and bell peppers. Cook for 5-7 minutes, stirring occasionally, until the vegetables are tender.
Add the ground beef and ground beef liver to the pot. Cook until the meat is evenly browned and crumbly. The liver cubes will thaw and cook as the meat browns.
Optional: For added depth of flavour, pour in a splash of red wine once the meat is cooked through. Allow it to reduce for 2-3 minutes, stirring occasionally.
Stir in the tomato paste, fresh or dried herbs, salt, and pepper. Mix well to combine the flavours.
Add the canned tomatoes with their juices to the pot. Bring the mixture to a simmer and let it cook for a couple of hours, stirring occasionally, until it reaches your desired thickness. The longer it simmers, the more flavourful the sauce will become.
Once the sauce has reached the perfect consistency, taste and adjust the seasoning with more spices or salt if needed.
Your rich and hearty meat sauce is ready to be served! Pair it with your favourite pasta or use it in other dishes.