In a pan make a sauce with onion, garlic and pepper, all finely chopped. Once golden add meat sauce, salt and pepper.
Once you have everything ready, we will make a baking sheet and put a first layer of potatoes, well stretched. We pour over the meat we have prepared and we will finish covering the rest of potatoes.
On the last layer of potatoes will grated cheese and butter dice. We will have the oven to 180 degrees and cook for about 25 minutes or until you see that it has already formed a golden crust.
When serving, try with a spatula catch him underneath, for the entire three layers remain.
To make the puree
Boil potatoes with skin. Peel and mash with a fork. Add a good piece of butter and salt. It must be crushed well so that there are no pieces. If you want to abbreviate can make the puree with envelopes, which are already prepared and where just add water and milk.