I assume they are referring to "Bitterballen", which is a fried ball of breadcrumb filled with meat ragout. They're delicious. Other than that, a very Dutch thing to do is put chocolate sprinkles on bread and we have, of course, "Stroopwafels".
For traditional meal food, we do this thing where we take boiled potatoes and a vegetable (such as kale or sauerkraut), add some tiny bits of bacon and/or ham and then SMASH THE ****ING **** OUT OF IT until it's a big mush. I hate it. It is usually served with smoked sausage.