The finished recipe. Grated Apple Porridge with SkyrIngredients 1 to 6. 45 g Gluten-free oats (Dry weight. Certified, which is the only thing that separates them from ordinary oats in the numbers.). About 300 ml Water. 100 g, about two-thirds of one, grated Apple. Half a teaspoon Ground cinnamon. 150 g Skyr. 10 g WalnutsIngredients 7 to 7. A pinch SaltStep 1. Grate the apple coarsely with the skin on.Step 2. Put the oats, apple, cinnamon, salt and water in a pan and simmer for five to six minutes, stirring, until the apple has gone soft and the oats are thick.Step 3. Spoon into a bowl, put the skyr on top straight from the fridge, and crumble the walnuts over.