Sorry I took so long to get to this! A shame about the lack of sunshine but you are persisting like a true gardener, experimenting to find solutions.
I've never eaten pumpkin leaves or flowers. Can it be from any pumpkin plant? What's the best way to cook them?
that's a good question. I actually don't know if you can eat the leaves out of any pumpkin plants. The ones I got were from the butternut and Jap pumpkin. Best way to cook for me would be stir-fry with garlic and seasoning with soy sauce and black pepper. There is a quick step to prep the leaves before you can cook but if you got young leaves, you can skip that step.