The stuffing is the ikur.

There is no such thing as a potato blintz.

There. I said it. I have stated this as a hard, unequivocal fact.

The only real blintzes are cheese blintzes. Cherry, cherry and cheese, strawberry, blueberry, apple-cinnamon (my personal favorite)- all these are pale imitations of the One True Blintz Stuffing, which is cheese.

Grated or mashed potato stuffed in dough is called a knish. So let it be written.

What is the difference, you may ask?

The accompaniments, of course. Blintzes are served with sour cream. Knishes are served with deli style mustard. It doesn't matter if anyone actually eats the sour cream or the mustard- I've happily eaten knishes with no mustard, just like I've eaten falafel with no techina- but it mamesh does not pas to serve blintzes with no sour cream, just like serving latkes with no apple sauce is a booshe despite the fact that it tastes just fine stam.

Ai, you can say that knishes are fried and blintzes are baked, but I can show you Gabilla's knishes (no website), which are both fried and baked and are delicious.

You can tell me that blintzes are rectangular and flat, whereas knishes are either round (pizza shop style) or square (Mom's Knishes)- but I tell you that this is no reiya, because a food is a food even when you change its shape. We learn this out from Italian slices, which everyone holds is still pizza even though it is puffed up and square and not flat and triangular.

And bourekas are no reiya, either, because I hold the same thing by bourekas- stuffing potato into dough makes it a knish whether it is square, round, or in the case of bourekas, triangular.

You can ask me what makes a boureka different from a blintz, and I can answer: you serve a boureka with schug, tomato salad, and a hard boiled egg.

Calzones are clearly the work of the Satan to confuse people, and I have serious doubts on what bracha is appropriate- and in any case, it is part of the pizza family.

If you ever wondered what your husband/ brother/ son does all night in the BM on Shavous night, now you know.