I bought this from the farmers market where it was labeled calabasas. I thought it was some kind of zucchini, but I was told it was a kind of cucumber. A cucumber with peach fuzz on the outside.
Here it is with the skin off and sliced:
I served it raw, sprinkled with salt, pepper, smoked paprika, and ground chipotle and ancho chili pepper. It was very good, like cucumber.