Cut up the potatoes, I like small pieces they cook faster, cover with water and set to boil. When the potatoes are easily crushed with a fork drain off all the water. Put the potatoes back in the pot while still hot add 1 stick of butter. Mash up thoroughly and add cream & sour cream. Mix thoroughly and add salt, pepper, garlic, and onion.
In a large frying pan lightly toast the flour. Slowly add butter until it becomes a paste. Add the drippings from the roast stirring briskly. Season with salt, pepper, garlic, & onion. Add shredded rabbit until you have a good meat/gravy ratio. Serve on top of the potatoes.