Heat the butter in a medium saucepan. When the foaming subsides, cook the shallots until tender. Add the mushrooms, cover and cook for 5 minutes or until tender. (If the mushrooms begin to stick to the bottom of the pan, then add some broth.) Add the quinoa and broth and bring the liquid to a simmer. Season to taste with salt and pepper and stir in cream if you wish. Bring back up to a simmer, remove from heat and stir in the dill.