Peel and slice the potatoes. Cut the bacon into strips and fry in hot oil. Add the potato slices and the sliced mushrooms, salt, pepper and deglaze with white wine. Let the wine evaporate over high heat while stirring, then reduce the heat and stew covered for approx. 25 minutes. Stir occasionally and check the fluid level. If this is too low, add a few tablespoons of water.