Place the octopus in a Dutch oven (casserole) and add the olive oil, lemon slices, parsley, and chili pepper and season with salt and black pepper
2
Cover the dish with a sheet of parchment paper, securing it firmly with kitchen string, place the lid on top, and cook over medium heat for about 2 hours (without removing the lid)
3
Remove from the heat, let the octopus cool in the dish, then cut into pieces and rounds and serve with its sauce (it is also good warm or even cold)