Pork tenderloin with onion sauce

Ingredienti

700 grams of tenderloin pork trimmed on visible fat and silver skin

2 red onions (I used the sweet ones from Tropea)

30 milliliters beer

about 10 slices of good-quality bacon

1 tablespoon butter

2 tablespoons cream

3 tablespoons olive oil 

rosemery

1 glove of garlic

salt and pepper

Sweet and sour pork tenderloin

Ingredients

600 grams of pork  trimmed of visible fat and silver skin
ground spices (pepper, sage,thyme)
orange juice ( 1 orange)
1 orange sliced
flour as needed
1/2 glass of white wine
2 tablespoons of olive oil