using the pasive voice

Process for make Mc. Donald´s Hamburguers

1) Firstly the company had to be purchased the meal.
2) Second the meal is ground and converted in sausage.
3) Third the sausage are packed and frozen.
4) Fourth the sausage are distributed each one store of the Mc Donald hamburguers.
5) Fifth the sausage is put into the bread, adding lettuce, slide of tomatoes and seasoning.
6) Finally the hamburguer is served to the costumer.