Cut the grapefruits in half horizontally, and cut the flesh from the skin with a grapefruit knife.
2 Florida grapefruits
Put the Florida grapefruit parts in the blender.
Now, peel the skin from the frozen banana with a peeler, cut the banana into pieces and, together with the yoghurt and orange juice, add it to the grapefruit in the blender.
1 banana - frozen, 100 ml orange juice, 150 ml non-fat yoghurt
Start the blender and let everything purée, add 4 ice cubes and the oatmeal and blend again until the ice has been crushed.
2 tbsp oatmeal, 4 ice cubes
Serve straight away in tall glasses.
Notes
For a dairy-free or vegan version, just use a plant based yoghurt instead of the non-fat yoghurt. If you have kefir, use that instead of yoghurt.Please note: calories and other nutritional information are per serving. They're approximate and will depend on exact ingredients used.