Scrub live clams thoroughly, rinse, steam 5 minutes, open, remove meat, and save the clam juice.
Wash clam meat in water containing 1 teaspoon salt per quart. Rinse, cover with boiling water containing 2 tablespoons lemon juice or 1/2 teaspoon citric acid per gallon, boil 2 minutes, and drain.
For minced clams, grind prepared clam meat. Fill jars loosely and add hot clam juice and boiling water if needed, leaving 1-inch headspace.
Pressure process half-pints 60 minutes or pints 70 minutes.
Dial gauge: 11/12/13/14 psi at 0–2,000/2,001–4,000/4,001–6,000/6,001–8,000 ft. Weighted gauge: 10 psi through 1,000 ft and 15 psi above 1,000 ft.