Line the base and two long sides of a 900g non-stick loaf tin with a strip of non-stick baking paper or clingfilm.
To make the granola topping, heat the butter in a frying pan, stir in the flaked almonds and cook for 2-3 mins, stirring until just beginning to colour.
Mix in the nuts and sugar and cook for 1 min until the sugar has dissolved, then leave to cool.
For the parfait, pour the coconut milk into a mixing bowl, add the lime zest and juice, honey and sugar and whisk until smooth.
Add the yogurt and whisk briefly until smooth.
Pour about one third of the parfait mix into the lined tin.
Crumble about one third of the blackberries over the top, then spoon over half the remaining parfait mix and repeat until everything is in the tin.
Level the mixture and spoon over the cooled granola in an even layer.
Freeze overnight, covering the top with clingfilm when hard.
Remove from freezer 15-25 mins before serving.
Recipe by appetite magazine at https://www.appetitemag.co.uk/frozen-blackberry-coconut-parfait/