Put olive oil into a pot and heat. Dice the onions and add to the pan to fry. When browned, take out about 1/2 cup of onions from the pan for adding texture to the hamburgers later.

Add any kind of mushroom (if necessary slice them) to the remaining onions and fry for a few minutes until browned. Add the canned tomatoes, 1/2 cup of water, soup stock and season with salt and pepper. Bring all to a boil on a medium heat.

Prepare a bowl and put in the minced pork/beef and egg. Mix together until the texture becomes sticky. Add chopped carrot and broccoli, seasoning, breadcrumbs, and cooked onions (saved from earlier) and mix well.

Roll up the mixture into golf ball sized balls and push in the centre of each ball a bit with your finger to flatten it a little. Put olive oil into a frying pan and fry the burgers on medium heat. When one side has browned and sealed nicely, turn over and fry on medium heat. No need to cook too well as this process is just to prevent the burgers falling apart during boiling.

Put the hamburgers into the tomato sauce mixture and simmer for half an hour on a low heat with lid on. Taste it and season as necessary.