Tex-Mex Casserole
["1 lb. ground beef", "1/2 (1.25 oz.) envelope taco seasoning mix (2 Tbsp.)", "1/2 (15 to 16 oz.) jar salsa", "1/4 c. sour cream", "1 1/2 c. tortilla or corn chips (about 18)", "1/4 c. grated Cheddar or Monterey Jack cheese", "1 medium onion, chopped"]
["Soak sweetbreads in salt water for half an hour.", "Boil until well done, then remove skins and small pipes and cut into small pieces."]
["ground beef", "taco seasoning mix", "salsa", "sour cream", "tortilla", "cheese", "onion"]