If you like sour candy: 180 grams=100 calories (180 grams in Sour Patch Kids=697 calories). Easy “recipe” in comments.

I lb Green grapes halved
2-4 tbsp. whatever sugar-free Jell-O flavor(s) you want
Citric acid powder to taste (I get mine at Sprouts in the bulk spice section)
Optional: lemon, lime or both

Halve grapes (you can keep them whole but I find them to be too big once frozen)

Optional: Combine 1 part citrus juice to 1 part sugar substitute in a pot and bring to a simmer until syrupy. Allow to cool slightly and then coat the grapes in the syrup.

I would freeze the grapes on parchment paper for 10-25 minutes so the jell-o powder and citric acid don’t dissolve into the surface entirely when tin sprinkle it on.

Stir together the jell-o powder and citric acid, and sprinkle over the grapes.

Freeze the grapes (I like their texture after an hour but if you freeze them entirely, they have a frozen yogurt/fruit popsicle consistency. Both are good imo)