I'm not sure what that is.
Klopt is a Dutch word that means correct, or it is correct.
While Brat is a German word meaning roast.
He could have been saying buy my correct roast or more literaly, I have the good sausage/food. Buy my bratklopt.
Otherwise I'm not familiar with that term or food.
Re: "Bratklopt" -
It looked like sausage patties - I assumed it to be mangled wurst cooked as patties. All I know is that it was really good... But thanks for trying to decipher my mangled verbiage.