I learned how to make these in Nancy, France from Sister Meyers while I was serving an LDS mission. I learned how to eat them with sauce tartar in Liege, Belgium. They had 26 different flavored sauces to go with their frites. I start to drool remembering!
(For Suzanna's Sweet 16 "Winter Defiance" party, we made burgers and fries to go with her Portal Cake. Big success, lots of fun!)
The secret to successful real Belgian fries: double fry.
Use good potatoes. Cut them by hand. SQUEEZE out moisture with clean kitchen towels, keep covered until ready to fry (we used peanut oil).
Heat oil to (325') hot, make sure low enough in pan that it won't overspill. Hot enough that a bread crumb fries and sizzles, not just sits and soaks up oil. Only put 1 1/2 cups fries in to cook at a time. Cook until just barely changes color, NOT BROWN on the first frying.
Set aside draining on paper towels, okay if cools off completely. Do 2nd fry right before serving. This time until brown, less than 2 minutes. Salt to taste.
I taught Max everything I know about this. He says he is still not sure about how to tell if the oil is hot enough. I think it is a practice thing, or buy a thermometer.
Now, armed with a bag of potatoes, a knife, a towel, some oil, salt, a deep enough pan, he can create wonder on his own.