Beef Brisket with Ginger Gravy

2 pkgs dry onion soup mix
2 cups water
8 to 10 pounds of beef brisket
12 ounces chili sauce
10 ginger snap cookies

Pour dry onion soup mix into bottom of a large roasting pan. Pour in water and stir to combine. Place brisket into pan and cover meat with chili sauce. Break cookies into pieces and sprinkle around meat. Cover tightly and bake at 350 degrees for 1 1/2 hours. Check occasionally and add more water if needed. Remove meat from pan and thinly slice. Return sliced meat to pan and spoon sauce over meat. Cover and cook another hour. Then turn heat down to 250 degrees and cook another 2 to 3 hours until meat is very tender. Serves 8 to 10.