These were good and a hit with the crowd, although a lot of Jews complained about using APF instead of matzo meal.
2# potatoes and 1/2 a large yellow onion, grated in the food processor
3 T Unbleached All Purpose Flour (or matzo meal)s
1 T salt
4 large eggs
The most important thing is to drain the potato/onion mix in a collander, and moreover to express as much moisture out of it as possible by squeezing fistfuls at a time.
We made about 5 batches for our party, on the flat top.