Blackberry Pecan Muffin

In a bowl, beat the eggs with the cream and zest. Sift the flour with the baking powder and sugar, and mix in the berries and the nuts. Start combining this dry mixture with the egg one and, when you get to two-thirds of it, add the melted butter and carry on with the rest of the flour. Butter the muffin pan and dust it with flour (or use paper moulds). Fill them two-thirds full and bake in a 190C oven for 20min or until a toothpick comes out clean.