Bologna tuna

Put pieces of tuna in boiling water for
1. 5 hours. Replace water every half hour. Finely chop the onions, garlic, celery, carrots and parsley greens. Heat the vegetable oil and 15 g of butter, put the chopped vegetables, brown, pour in the floor of a glass of water, put it out a little. Add pieces of fish, remaining butter, salt and bring to a boil. Pour the finished dish over the lemon juice.