NANAY'S LENGUA WITH MUSHROOM SAUCE

NANAY'S LENGUA WITH MUSHROOM SAUCE 3-4 kg Lengua (Ox tongue), cleaned and washed thoroughly ¼ cup pounded garlic, with skin on 1 white onion, peeled and quartered Splash of White vinegar Splash of Fish sauce, to taste ¼ cup butter 2 cups finely chopped red onions 1 can cream of mushroom soup Worcestershire sauce Broth (from boiling the Lengua) 1-2 cups all-purpose cream 2-3 cups sliced button mushroom Grated cheese