We put the beans "Tierrina Vaqueira" in cold water, 10 to 12 hours before in a casserole proportionate to the quantities so that they are well covered with water.
Put the beans with the blood sausages, the chorizos, the bacon or bacon, the garlic (well chopped), the bay leaf, the whole onion and a splash of oil (all cold).
It is put to slow fire and broken the boiling they are frothed and they are left to cook slowly a little uncovered, trying that the beans are always covered with water.
Let them cook for one hour. Cold water will be added from time to time in small quantities to cut the boiling. The saffron is added and it is left half an hour more. (it can need some more time). Finally salt is rectified.
It is convenient to move from time to time so that they do not stick to the bottom. Remove the onion and let it rest for half an hour before serving.