A lovely way to use up the seasonal rhubarb glut, and one that tastes like a treat while actually being pretty healthy. Makes 20 squares Ingredients 450g rhubarb, chopped into 2cm pieces 30g caster sugar 30g soft brown sugar 100g dates 200g butter 100g desiccated coconut 200g plain flour 2 teaspoons ground ginger 30g oats 1 egg yolk…