For the compote, peel, quarter, core and chop apples. Put them in a pot with sugar, lemon and apple juice. Simmer while stirring for about 5 minutes until the apples are soft, but not yet crumbled.
For the dough, peel the potatoes, wash them, grate them finely and let them drain in a sieve. Peel and grate the onion. Mix with potatoes, eggs and 1 teaspoon salt. Stir in 3 tablespoons of flour.
If the dough is too soft, stir in a spoonful of flour.
Heat a waffle iron and brush with oil. Put 3-4 tbsp. of dough in the middle of each wafer, spread lightly and bake about 4 golden yellow wafers one after the other. Serve still warm with apple compote and maple syrup.