Pour oatmeal into a pot and cover with plenty of tap water, mix and drain the murky water, repeat 2-3 more times until water is clear without grain husks.
Add 1 and 1/2 cups fresh water and bring to a boil. Reduce heat, cover and cook for about 8 minutes, stirring several times meanwhile.
Remove lid, add coconut milk and sugar to taste, mix and bring to a boil. Cook for about 5 minutes, stirring occasionally.
Put raspberries in a separate pot and heat while stirring until they break down. Pour over servings of oatmeal, you can additionally drizzle with maple syrup or orange juice.