Yellow cherries have a very short season; once picked, they must be eaten or preserved quickly as they will darken. Husband and wife Kostya and Lyuda have a tradition of making this jam every year for their family and friends. I am a lucky recipient of one precious jar each year, but their daughter Katya gets the lion’s share. Like most teenagers these days, Katya prefers to eat “cooler” things that aren’t made at home, but