Step 1

In a small skillet, heat the raspberries, sugar, lemon juice, water, and a lemon slice over medium-high heat.

Step 2

Lower the heat when it starts to boil. Let it simmer for about 10 minutes until the raspberries have melted.

Step 3

Take it off the heat and let it cool for about 10 minutes.

Step 4

Pass the liquid through a strainer and store it in the refrigerator in a sealed container.