I strongly advise you to add sun-dried tomatoes to this stew, they will give a bright shade to this hearty winter stew.
Mince fry for 1 tbsp. l. butter and transfer to a bowl. Onion and pepper cut into cubes, sun-dried tomatoes into strips, then fry everything in the remaining butter and combine with meat.
Pour the broth over everything, add the passata and the garlic passed through the crusher. Stir, bring to a boil, reduce heat.
Add bay leaf, thyme to taste and 1 tsp. or more sugar to balance the acidity in the passat. Add salt and pepper.
Simmer for 5 minutes. Put the diced potatoes to the meat, cover and simmer, stirring, for about 20-30 minutes until tender (potatoes take a long time to cook in an acidic environment). If you want a thicker sauce, remove the lid and cook without it for a while.