Tongue is indeed served on bread, thinly sliced and cold.
I like cooking, and my experimental kitchen endeavours have spanned quite a range of ingredients, but I must confess I have never made a hot dish with cow tongue. I wouldn't even know how to prepare it properly.
Today I made a tasty dark mushroom soup. Roasted two large portbellos in the oven together with a sliced bellpepper, both marinated in oil mixed with garlic, thyme, black pepper, a little bit of sweet soy sauce and some laos (siamese ginger) for 25 minutes
I then added that to a broth made with chestnut champignons, red onions, some more garlic, a cube of strong beef stock and a cube of varied forest mushroom stock.
Except for the cube of beef stock, it's vegetarian.
I don't eat vegetarian as often as I would like to. Mostly because in this strange country, meat is more affordable than vegetarianism and I ain't very wealthy.
Sure, veggies are mostly cheap. But other (what I consider to be) essentials like nuts and fruit, and the various modern meat replacers add up to being darn expensive if you want to eat a balanced diet. Oh and honey... Why is honey so darn expensive.. The good quality honey produced from varied flower contains many different trace elements you miss out on if you don't eat meat or fish.
Meat is just too subsidized, and aggressively marketed over here. For example, supermarkets' weekly special offers include meat products way more often than they do vegetarian products.
EDIT:nomnom just finished eating a bowl. Damn, those portbellos are tasty. I didn't slice them up when boiling them with the broth, I just floated them upside down, and dunked them under a few times.
Sliced them in managable parts when serving the soup. They really retained their roasted marinade taste that way.