Not the point of the post but it is important not to be afraid of ingredients. Potato starch, yeast extract, beetroot colour etc. These are in a lot of foods, and are not scary.
For people worried about processed food with a lot of ingredients, perhaps they get their burger on its own? Because this is the list of ingredient in the bun:
Enriched Flour (Wheat Flour, Malted Barley Flour, Niacin, Iron, Thiamine Mononitrate, Riboflavin, Folic Acid), Water, Sugar, Yeast, Soybean Oil, Contains 2% Or Less: Salt, Wheat Gluten, Potato Flour, Vinegar, Dextrose, Corn Starch, Modified Food Starch, Vegetable Proteins (Pea, Potato, Rice And/or Faba Bean), Sunflower And/or Canola Oil, Maltodextrin, Natural Flavors, May Contain One Or More Dough Conditioners (DATEM, Ascorbic Acid, Mono And Diglycerides, Enzymes).
I would also add, that I think “beef” ingredients should also include everything the cows are fed and injected with prior to slaughter. Now that might put a few “clean” folk off.