I suggest a recipe for a 10% brine with nitrite and spices (100 g of brine per 900 g of meat).
Ingredients for one liter of brine:
800 g of water
160 g of nitrite salt
30 g of sea or table salt
30 g of phosphate
20 g of black pepper
20 g of juniper
40 g of sugar
10 g of granulated garlic
10 g of granulated onion
a small bay leaf
5 g of sodium ascorbate (antioxidant)
Boil the brine and strain after 60 minutes.