Place apple, lemon zest and juice, caster sugar and goats milk in saucepan. Add 50ml water and bring to the boil. Reduce heat, simmer, partially covered, for 10 to 15 minutes, until apples are soft.
Cool for 5 minutes, pureé until smooth.
Dissolve gelatine in 45ml (3 tablespoons) hot water then quickly stir into the apple mixture.
Pour into 4 to 6 tall glasses. Chill until set – 2 to 3 hours. Top each with yogurt or cream, seasonal fruits and mint to serve.