A Spanish butcher taught me this trick. The meat melts in your mouth like butter

Nobody has ever done anything like this! The meat melts in your mouth like butter!
Ingredients:
2 pounds or 700g pork belly.
I put it in a jar.
Light wheat beer 1 bottle or 500 ml.
Cover with a lid and let marinate for 30 minutes.
after 30 minutes.
remove excess moisture.
Fry in vegetable oil for 5 minutes on each side.
3 onions.
cut into half rings.
Salt.
Sauté the onion for 5 minutes.
Herbs from France.
sweet peppers.
Light wheat beer 1 bottle or 500 ml.
Cover and simmer over low heat for 30 minutes.
2 pounds boiled potatoes.
Cut like in the video.
3-4 tbsp sour cream.
Lemon juice 1 tbsp.
Mustard 1 tbsp.
Honey 1 tsp.
Vegetable fat.
Salt.
black pepper.
Red onion.
Pickle.
Dill and parsley.
Cucumber
Parsley.
Sour cream.
Salt.
That's all.
Bon appetit.