Pour the mixture into a large mixing bowl, add the butter in pieces and stir until melted, then add the orange and lemon extracts (or zest) Beat in the eggs until smooth, then stir in the fruit.

Seville oranges are sold in the last three weeks of January. Bitter (Seville) oranges are classically used in cooking, not just in marmalade but also in dishes such as Duck à l’orange.