Place all the ingredients in a heavy-bottomed pot. Bring to a low simmer, stirring often with a silicone spatula. Make sure to scrape the bottom and sides frequently with the spatula to prevent sticking.

Simmer for about 45 minutes or until the desired thickness is achieved. What you are doing is evaporating the liquid and reducing the moisture content. the longer you simmer the thicker the syrup will be.

Place a fine-mesh sieve on a bowl with tall sides. Pour the fruit mixture into the sieve and let it drain for a few minutes. Use the back of a spoon to press the syrup through the sieve, leaving the seeds behind, or you can use a Victrola Food Strainer for an easier and more complete straining. 

Return to pan to the burner and bring back to a soft simmer for 5 minutes.

I usually water bath can the syrup, 12 minutes for Pints, 10 minutes for 1/2 Pints.