Start the oven on 225 degree Celsius on electrical heat.
Butter a baking/pie form.
Divide the strawberries in half and put them in the baking/ pie form.
Put the flour and the oatmeal in a bowl.
Divide the margarine in small pieces and pour them down in the flour.
Grind the margarine together with the flour and oatmeal with your fingertips or a fork until it forms a crumbly dough, until you don’t have any big butter lumps.
Pour the crumbles even on top of the strawberries.
Put the pie in the middle of the oven for 20-25 minutes, or until the crumbles are golden brown.
Let the pie rest for a few minutes before serving together with vanilla ice cream or vanilla sauce.