Doorknob?

@jean Nope, but I see why you guessed that, and would not have thought of that myself.

madeleine forms?

Upside-down manual citrus juicer?

@gregmoore Yes, I agree. It looks like that.

@anniegreens Oh, now I want madeleines. Kitchen related, but alas, not a pastry form.

@gregmoore Yes, but define upside-down, just for fun.

You have the normally convex part the fruit is pressed down onto flipped and are showing it’s concave underside.

@gregmoore I think of that as the upside, but I believe you have it correct.

Here is the whole device.

@odd @jean @anniegreens

It’s not quite as I expected. I thought it was glass, like this. (More or less).

@odd Understandable. Same shape, similar reflectance. The stainless steel squeezer was a gift and I'd never seen one before. Usually those hand squeezers come from Mexico and are powder-coated cast aluminum, green for the lime size, yellow for the lemon, and I think I've seen a large orange version as well.