Make Strawberry (Raspberry) Sauce. Rinse Strawberries, remove the hulls, and slice thickly. Place them in a saucepan, squash a little bit using a masher or spoon to let some juice come out, as this will speed up the cooking process. Add Sugar and bring to the boil over medium heat, stirring occasionally. Reduce heat to low and simmer for 10 minutes, stirring occasionally. The sauce will thicken up slightly as it cools.