Syn Free Best Ever Bolognese Meat Sauce (Instant Pot)

kg/2.64lbs of extra lean ground beef

onions, finely chopped

garlic, crushed

stalk of celery, finely diced

medium carrots, finely diced

zucchini, finely diced

g/9oz mushrooms

litres/6 cups of canned plum tomatoes, crushed up

cup/240 ml of passata

cup/240 ml of beef stock

tomato paste

mixed herbs

fresh chopped Italian parsley

fresh chopped basil

balsamic vinegar

salt and black pepper to season