Press rolls in a 9" pie plate. Brown hamburger with chopped onion, drain. Add water and seasoning. Bring to a boil. Pour over crust. Next spread sour cream over hamburger, then sprinkle the cheese over sour cream. Bake at 350 degrees for 25 minutes. Crush Fritos or Doritos and put on top of pie. Bake 5 minutes more. Serve with shredded lettuce, chopped tomatoes and salsa