3 veal burgers onion low Recipes

veal or 2 lbs turkey, minced, salt and pepper, water, beef bouillon cubes or 1 -2 chicken stock cube, onion, chopped, mushroom, sliced, cornstarch (cornflour), cold water

freshly ground beef (preferably 80/20), champagne vinegar, mustard seed, honey, salt, vegetable oil, onions , julienned, veal stock or store-bought low-sodium beef or chicken stock, very thin slices pancetta, salt and freshly ground pepper, brioche rolls, taleggio cheese, sliced, beefsteak tomato, sliced, head bibb lettuce, leaves separated