Irregular pear-shape

Hi. I want to create Irregular pear shape (red curve) with the diameter of the black ellipse curve. Is there any way to make it? Many thanks!

You might want to do with revolve, which makes a perfect pear.
Then turn on points to manipulate directly.

Other is adding a few more red curves to do a networksrf.
The red curves need to be split into open curves.
So four reds and black closed curve.

Thank you for your reply. I discovered another way to do it. i split the red curve into half, then use extrude closed planar curve for some thickness, and then use blend surface to create the surface. After that i delete the extrude curve and mirror it to complete the whole thing.