Putting it all together:

In a medium pot combine blueberries, raspberries, and sugar.

Zest the whole lemon and add to the pot.

Cut the lemon in half and squeeze out all the juice.

Place 4-5 spoons in the freezer.

Boil over medium heat until you have a strong boil.The bubbles should not break up when you are stirring.

Let it boil uncovered for approximately 15-20 minutes,stirring frequently.

When the mixture begins to look like jam, insert frozen spoon.

The jam should slowly fall off in a clump, NOT drip.

You can also run your

finger thru the middle on the spoon and get a line like in the picture.

If it is not thick enough continue to boil and retest in a few minutes.

Once it is thick enough,remove from heat and place in container.

Let cool with lid off at room temperature.

Once it is cool place lid on and refrigerate.

It will keep for up to 2 weeks if you don't eat it before then.