Gather your ingredients so that you have everything close at hand on the counter or table.
Prepare the Marinade
In a medium bowl, combine 10 oz beef stock, 3/4 cups soy sauce, 1/4 cup lemon juice, 2 tablespoons minced garlic, 2 tablespoons liquid smoke, and 2 teaspoons smoked paprika.
Place 5-7 pounds beef brisket in an oblong baking dish or roaster that has been lined with a large sheet of aluminum foil.
Pour the prepared marinade over the meat being careful to keep the liquid inside the aluminum foil. Sprinkle with 1 teaspoon ground black pepper.
Fold and tightly seal the aluminum foil and allow to marinate in refrigerator for 12-18 hours. (18 hours is best.)
Bake the Brisket - Low and Slow
Bake in 300℉ oven for 6-7 hours as needed, (allow at least 60 minutes per pound) checking three or four times to pour juice over the meat.
When the meat is fork tender and easily falls apart, remove from oven. Allow to rest for 15-20 minutes before slicing, cutting across the grain.
Serve with your favorite barbecue sauce, with mashed potatoes and gravy, or as an open-faced beef sandwich. Serves 8-10.