Seville oranges from Spain. Also called bitter or sour oranges, they are prized for their intense, tart orange flavour. To candy the peels, they are gently soaked in a warm sugar bath followed by air drying (spa treatment for oranges). These 2 steps are repeated until the right balance of sweet, bitter and tart are achieved in a preserving process that takes a few days. We lay the peels by hand onto a base of great dark chocolate.