Finely grate the zest from 1 blood orange into your blender, keeping a pinch of zest back for garnishing. Halve all 3 blood oranges and squeeze in the juice.
Peel and break in the bananas. Roughly chop the dried dates and add them to the blender. Tuck in the baby leaf spinach.
Pour in 330ml of the oat drink (save the rest for this week’s other smoothies). Drop in a few ice cubes and whizz till smooth. Pour into 2 glasses, top with the reserved range zest and serve.