If your rhubarb is very sharp, add an extra tablespoon of honey instead of sugar for roundness. | For extra crunch, sprinkle 1 tbsp demerara sugar over the top before baking. | If you are short on butter, use 40g butter and 1 tbsp oil. | Ratio to remember for cobbler topping: roughly 2 parts oats, 1 part flour, 1 part fat, small splash of milk. | Keeps 3 days in the fridge. | Reheat in oven or air fryer to re-crisp the topping. | Cold with Greek yogurt for breakfast is genuinely great. | You can freeze portions and reheat straight from frozen at 160°C until hot through.