Donkey Sauce, to be exact.
The fact that this somehow didn't make the cut is a bit upsetting, though thankfully the internet, for all of its unforgivable flaws, has come up huge here.
I could go on for a sentence or two describing how "spot on" and "really just too perfect" this is, but the best takeaway from this segment is the context. The sketch is based around Fieri reacting to the scathing review of his new NYC restaurant by the New York Times, so it's important to consider why anyone would go to Guy Fieri's restaurant in the first place--as the sketch points out, it's for the same reason why people go ape shit over the endless breadsticks at Olive Garden. "It's like comparing apples and fat dirt."
In conclusion, gluttony FTW.