***UPDATE***
Chili sauce is like ketchup (NOT spicy thai chile sauce) - I always find it with the ketchup, usually on the top shelf and there is typically only one or two kinds (heinz and store brand) - it tastes like ketchup but is a little thicker - hope you have better luck with it this way! I can imagine that with taco sauce it would give it a totally different flavor (and texture, as taco sauce isn't as thick :))
I don't feel like I can give this a star rating because I submitted the recipe - but I think it's delicious, and allrecipes makes you give a rating, so 5 stars :) I usually add a little bit of minced garlic to the mix, as well, and extra chili sauce (it tends to fall apart with too much, though, so watch out :)). The chili sauce is good even with just beef (or even ground turkey) if you don't have sausage. Be careful not to overcook, though, because the meat will stay red due to the sauce. Use a meat thermometer if you want to make sure it's done, or just grill as you would any other burger.
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