• If you have the time, peel each banana and break each into 4-5 pieces and freeze until solid. Place into a food processor and blend with the remaining ingredients until thick and smooth. Divide between 2 glasses and serve immediately. Scatter extra granola on top to decorate.

Variations:

• Raspberry & chia seed: make up as above omitting the peanut butter and adding 150g (5oz) fresh raspberries and 2 tbsps chia seeds.
• Avocado, mint and lime: make up as above omitting the peanut butter and adding the flesh of 1 avocado, a handful of fresh mint leaves and the juice of 1 small lime.

Cooks' tip

Frozen banana, kale, avocado and spinach are all great ingredients to have in your freezer to use for different smoothies - having these already frozen gives your smoothies that instant cool for a hot summer’s day.