There's a brand (French, I think) of Jam [0] that's widely available in stores here in America; I've found that their jars make fine rocks glasses once the jam

There's a brand (French, I think) of Jam [0] that's widely available in stores here in America; I've found that their jars make fine rocks glasses once the jam is all used up. [0] https://assets.bonappetit.com/photos/5981f6d764829819a9174b46/16:9/w_2560%2Cc_limit/Bonne-Maman-Lede.jpg https://assets.bonappetit.com/photos/5981f6d764829819a9174b4...