Heat oven to 170°C fan (190°C conventional).
Grease and line a 20cm round cake tin or 23 x 13cm loaf tin.
Beat butter and sugar until pale and fluffy (3–4 minutes).
Beat in the egg yolks one at a time.Mix in the lime zest, juice, vanilla and coconut cream.
Fold in the flour, baking powder, salt and coconut.
Whisk the egg whites to soft peaks. Fold one-third into the batter to loosen it, then gently fold through the remainder.
Spoon into the tin.Bake for 40–50 minutes, until a skewer comes out clean. Cool for 15 minutes before removing from the tin.