Excellent jam and no Certo needed. The raspberries have natural pectin in their seeds and that is enough to thicken it. 5 lbs = 9 cups crushed berries.

Ingredients

mashed raspberries4 cups
sugar↗4 cups

Step-by-step instructions

1
Use a very large pot.
2
When the jam reaches a full rolling boil it will double in volume.
3
Heat mashed berries until they reach a full rolling boil.
4
Boil 2 minutes.
5
Add sugar.
6
Stir well.
7
Bring to a boil, stirring constantly, boil for 2 minutes.
8
Remove from heat.
9
Beat with rotary beater for 4 minutes
10
Pour in sterilized jars and seal.

Source: food.com

Original recipe ↗

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