The seeds are definitely squash-like..with the body like watermelons. Their shape is is a giant zucchini.
So what's the taste? how did you cook it?
In the Philippines, probably we will chopped it in 1.5 in, 1 cm thick. Sautee with garlic, tomatoes and onion. Add a bit of H2O then let it simmer to cook. Personally, i will start with a it fried chopped pork before sauteeing.

Those flowers can also be covered in flour and deep fry. I do that here whenever I found some.