From the Taco Bell website: http://www.tacobell.com/nutrition/ingredient-statement/
"Seasoned Ground Beef
Beef, Water, Seasoning [Isolated Oat Product, Salt, Chili Pepper, Onion Powder, Tomato Powder, Oats (Wheat), Soy Lecithin, Sugar, Spices, Maltodextrin, Soybean Oil (Anti-dusting Agent), Garlic Powder, Autolyzed Yeast Extract, Citric Acid, Caramel Color, Cocoa Powder (Processed With Alkali), Silicon Dioxide, Natural Flavors, Yeast, Modified Corn Starch, Natural Smoke Flavor], Salt, Sodium Phosphates. CONTAINS SOYBEAN, WHEAT"
By the way, there is nothing I can find on the "Ingredients Statement" page that is called "taco meat filling". I suspect that this term might have been invented by a reporter or perhaps a lawyer in connection with the suit.
I am not
saying that Taco Bell is using 100% ground beef, but the FDA does
require that the ingredients on an ingredient list be listed "in descending order of predominance by weight", which means there must be more ground beef (by weight) than water and more water (by weight) than the Seasoning mixture, Salt or Sodium Phosphates.