Peel the onion and the garlic and slice them in small pieces.
Cut the mushrooms in small pieces, save 2 for decoration.
In a frying pan heat up some olive oil and fry the mushrooms, garlic and onion until the water disappear.
Mix all the minced meat and the vegetables in a bowl.
Place the bread slices in milk and let it soak in. Drain the bread and then crumble it with the rest of the ingredients.
Mix all the ingredients well, place it on a baking sheet and form it like a a loaf, or place it in a cake form. Place the rest of the mushrooms on top of it.
Preheat the oven at 200 degrees Celsius, and place the terrine in the middle of the oven for 50 minutes.
Take out the terrine and let it cool down before serving it.