1. Choose ripe strawberries: The first step in harvesting strawberries for jam is to select only ripe strawberries that are red all over. Avoid strawberries that are green or white as they will not be fully ripe and will not have as much flavor.
2. Wash the strawberries: After harvesting the strawberries, it is important to wash them thoroughly to remove any dirt, debris, or pesticides that may have been on them.
3. Hull the strawberries: Hulling means removing the green leafy top from the strawberry. Use a paring knife or a strawberry huller to accomplish this task.
4. Cut the strawberries: Cut the strawberries into small pieces; this will make it easier to mash them later on.
5. Mash the strawberries: Use a potato masher or food processor to mash the strawberries into small pieces.
6. Cook the strawberries: Place the mashed strawberries in a large pot or saucepan and cook them on medium heat. Add sugar gradually, and stir until it dissolves.
7. Skim off the foam: As the strawberries cook, a foam will form on the surface. Use a spoon to remove it to keep your strawberry jam clear.
8. Store the jam: Once the jam has finished cooking, transfer it to a clean glass jar and allow it to cool before sealing it.
9. Label the jar: Write the date, ingredients, and any other relevant information on a label, and stick it to the jar.
10. Enjoy the jam: Store in the refrigerator and use it on toast, muffins, scones or in any other recipe you like.