Follow these simple steps to create your own delicious Rømmegrøt:

1. Heat the Sour Cream: In a large pot, heat the sour cream over medium heat until it begins to bubble. Stir occasionally to prevent sticking.
2. Add Flour: Gradually whisk in the flour, ensuring no lumps remain. Continue to cook for about 2 minutes, stirring constantly.
3. Incorporate Milk: Slowly add the milk, continuing to whisk until the mixture is smooth.
4. Season: Add salt and sugar (if using), mixing well.
5. Cook Until Thickened: Continue to cook the mixture over medium heat, stirring frequently, until it thickens to your desired consistency. This usually takes about 10-15 minutes.
6. Adjust Consistency: If the Rømmegrøt is too thick, you can add a little more milk to reach the desired creaminess.
7. Serve: Once thickened, remove the pot from heat. Serve the Rømmegrøt hot in bowls.