Peel, wash and cut the sweet potato into very small cubes. Heat 1 teaspoon of oil in a frying pan with lid. Fry ham slices in it from each side until crispy. Drain on kitchen paper.
Heat 1 tablespoon of oil in the frying fat. Sauté the potato cubes all around. Add 6-7 tablespoons of water, bring to the boil, cover and cook until soft for about 10 minutes.
In the meantime, wash, sort and drain the baby salad. Cut the chilli lengthwise, remove the seeds, wash and chop very finely. Put the potato cubes together with the liquid in a bowl. Stir in 5 tablespoons of vinegar and chilli.
Crush everything roughly with a fork. Let it cool down.
Break the ham slices into large pieces. Clean the mushrooms, wash if necessary and cut into thin slices. Whip 4-5 tablespoons of oil under the potatoes. Season with salt, pepper, 1 pinch of sugar and possibly vinegar.
Mix all salad ingredients with the sweet potato vinaigrette and serve.