Put the orange rind and juice in a
measuring jug and sprinkle the gelatine over. Leave to soften for 5
minutes. Stand the jug in a pan of hot water and stir until the
gelatine has dissolved (or dissolve briefly in the microwave). Make up
to 600 ml with orange juice. Turn into a 600 ml jelly (jello) mould
and chill until set. Dip the mould briefly in hot water, then turn out
on to a serving plate and serve cold.