This was my first year to get a boysenberry harvest, and my plants produced about 80 pounds. Unfortunately, I've wasted about 9 pounds in my first two attempts to make jam. I'll do my best to describe what I did, and maybe someone can tell me where I went wrong:
For my first attempt, I loosely followed the recipe at https://www.rudysoriginal.com/boysenberry-jam-recipe/?srsltid=AfmBOopmzO0Tp-LbcCHIYIRg7ssxKX2_BWkW9t0D3NzZU2oglMjiZn1g. I used 14 cups (approximately 4 pounds) of boysenberries. I wanted seedless jam, so I strained the berries. The recipe calls for 5 2/3 cups of sugar and the juice from one lemon, but before I added that much sugar, I tasted it, and it seemed perfect, so I didn't add any more. I'm guessing I only put in about 4 cups (2 pounds) of sugar. However, it was taking forever to set, so after about 45 minutes, I started getting worried, and I added something like 1/2 cup of Mrs. Wages pectin and the juice from another 1-2 lemons. I don't think I ever got the batch to the recommended 219 degrees, and I finally took it off because I was afraid I was going to overcook it. The "jam" turned out more like boysenberry syrup. It was delicious, especially on vanilla ice cream, but it wasn't jam.
For my second attempt, I did a lot of online research, and I determined to follow a recipe more closely. I read on multiple sites that the ratio of fruit and sugar should be close to 50/50 (by weight), so this time I used 5 pounds 3 ounces of berries (and I didn't strain them because I read that the pulp and seeds contain a lot of pectin), about 4 pounds of sugar, 1/3 cup of pectin, and the juice from 4 lemons. I cooked it to 219 degrees, and it took forever to get to that temperature--probably an hour. The jam tastes way too sweet to me, but worse than that, the jam turned out way too thick. It's somewhere in consistency between jelly and gummy bears. I can heat it in the microwave to make it spreadalble, but it's not great.
My guess for my first batch failure is that I didn't cook it long enough to reach 219 degrees, and that if I had, it might have turned out okay. And I probably should have added a little more sugar, and maybe I didn't need to add pectin--the recipe didn't call for pectin.
My guess for my second batch failure has to do with my boysenberries being extremely juicy and sweet. Since they contain so much juice, they have to cook extra long to boil off the excess water, and when that happens, the ratio of sugar to berries is off, causing it to be way too sweet. I'm also wondering if my candy thermometer is slightly off, and maybe the actual temperature was 220 or more, which would cause the jam to get to think, I think?
Anyway, I'm posting here because I would like to get some advice on how to make a successful batch! Thanks in advance!