Preheat the oven
to 180.C/350"F/Gas 4. Grease and baseline two
23cm/9in sandwich tins. Sift together the flour,
baking powder and salt.
Beat the butter
until soft. Add the sugar and lime rind and beat
until pale and fluffy. Beat in the eggs, one at a
time.
Gradually fold in
the dry ingredients, alternating with the lime
juice, then stir in two-thirds of the coconut.
Divide the
mixture between the cake tins, even the tops and
bake for 30-35 minutes. Cool in the tins on a wire
rack for 10 minutes, then turn out and peel off the
lining paper.
Bake the
remaining coconut until golden brown, stirring
occasionally. For the frosting, heat the sugar,
water and cream of tartar until dissolved, stirring.
Boil to reach 120.C/250"F on a sugar thermometer.
Remove from the heat and, when the bubbles subside,
whisk in the egg white until thick.
Sandwich and
cover the cake with the frosting. Sprinkle over the
toasted coconut. Leave to set.