Place a pot over heat (if you haven't already) and boil some water. When it boils add the bergamots and boil them for 20 minutes. They will float in the water so it is a good idea to place an upturned plate in the pot over them.Remove them with a sifter ladle, place them in another pot with boiling water and let them boil for an additional 15 minutes. The water will still be yellow.Remove them with a sifter ladle, place them in a pot with tepid water and set them aside for the next day. Discard the yellow water that they have boiled in.(If you haven't grated the peel deep enough, repeat the boiling process in clean water for another 25 minutes.