Bran-raisin Muffins

• 12 muffn
• 1 egg
• 240 ml buttermilk
• 190 gr shreds of wheat bran cereal
• 160 gr all purpose flour
• 130 gr sugar
• 120 ml boiling water
• 85 gr raisins
• 60 ml vegetable oil
• 6 gr baking soda