Have you had an intergenerational sandwich?

purplepoppy
A nice old man has told me it's his grandson's 18th birthday this weekend and has invited me to partake in an intergenerational sandwich. It sounds nice, even though I've no idea what's in one. I like sandwiches, especially crusty ones. I was going to bring a bottle of wine, is that OK?
Have you had an intergenerational sandwich?
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