For the ratatouille salad, clean, wash and dice the peppers. Peel and finely dice the onion. Mix with paprika, lemon juice and 3 tbsp. olive oil. Season with salt, pepper and sugar.
For the waffle dough, grate half of the Parmesan finely and slice the rest. Wash basil, shake dry and pluck leaves. Cut half of the basil into fine strips. Wash and clean the zucchini and roughly grate the flesh all around until the seeds are removed.
Cream butter with the whisks of the mixer. Add the eggs and 1 tbsp. flour in turn. Mix the rest of the flour, baking powder, oat flakes and grated parmesan. Alternately stir into the butter-egg cream with buttermilk. Stir in zucchini, 1⁄2 tsp. salt and basil strips.
Heat a heart waffle iron and brush it thoroughly with oil. Bake a total of approx. 8 waffles, but spread 2-3 tbsp. of the dough lightly on the waffle iron surface. Close the waffle iron and bake the zucchini waffles for 3-5 minutes each. Keep warm in a hot oven (electric cooker: 80 °C/circulating air: 60 °C/gas: see manufacturer) until all waffles are baked. Serve with salad, rest of basil and cheese shavings.