Spanish Tortilla with Peppers, Scallions and Bacon

Peel and slice potatoes. Peel and finely chop onions. Cut bacon into thin strips. Rinse, trim and cut scallions crosswise on the diagonal. Rinse and halve peppers, remove seeds and ribs, and cut crosswise into strips. Heat clarified butter in a frying pan. Add potatoes and fry briefly. Add bacon and onions and cook briefly. Stir in scallions and peppers and cook about 5 minutes. Season with salt and pepper. Whisk together eggs and milk, season lightly salt and pepper and pour over potato mixture. Cook briefly until edges are set, then transfer to the oven and bake until eggs are set, about 25 minutes.