Easy White Sauce for Gratin

• 3 tbsp White flour
• 3 tbsp Margarine
• 1 Soup stock cubes (crushed)
• 1/4 tsp Salt
• 500 ml Milk

1. Without turning on the heat, put the margarine and flour in a pot.
2. Turn the heat on low and heat the while mixing with a spatula.
3. Once the margarine has melted, turn the heat to medium, then mix in 50 ml of milk at a time.
4. Be careful not to let it come to a boil.
5. Once all the milk has been added, turn the heat to low, and mix in the soup stock and salt a little at a time, checking the taste as you go.
6. Once the taste is just right, it's done.

white flour, margarine, salt

Taken from cookpad.com/us/recipes/153354-easy-white-sauce-for-gratin (may not work)