Sugar-free jam for winter! It is stored all year round! Thick berry jam!

Hi! Today I will show you an interesting healthy recipe! You will learn how to make berry jam without sugar, which can be stored all year round. What is really important for the safety and jam, and what is not important at all? How to make berry jam without sugar thick, without resorting to long boiling? All the secrets are in this video!
This recipe is suitable for those who prefer a healthy diet, as well as vegan and vegetarian recipes.
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Calories per 100 g: 52.6 Calories, 0.8 Protein, 0.2 Fat, 10.7 Carbohydrates
The total weight is 910 g
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Ingredients (for 0.75 liters of jam):
Pitted cherries 900 g
Agar-agar 3 g (1 tbsp. l. without slide)
Sweetener to taste (I have the equivalent of 100 grams of sugar in sweetness)
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For thick jam, up to 10 grams of agar-agar can be used for this amount of berries. My agar-agar has a strength of 900.