I just got a good deal on some fresh beef briskets. Saltpetre Use enough Kosher or Pickling salt mixed with water to float an egg. Use only plastic or enamel coated containers.
Metal does something.
Let meat stand in brine 24 hours. Let stand 2 weeks in refrigerator turning over daily. Blend until coarsly chopped. Add brown sugar. Add measured curing salt to spice mixture you set aside.