Our Russian neighbor who made us crabapple jam moved to California.

They served us with tea. Russian crabapple jam is more like appetizer. They cook just sugar and water.

Crabapple 

Rosaceae バラ科 | Malus | Malus coronaria

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Our crabapple tree is in front of my room. So I can see how they are and take pictures when squirrel come to eat them. I saw three were on the tree one December.

I found this video how to make American way of crabapple Jelly.