1 - The time to use dandelions is in the early spring before they have blossomed.
2 - They should have the roots cut off, be washed thoroughly and drained before cooking.
3 - Place them in boiling water (not too much) to cook until tender, salting the water when they are partly cooked.
4 - As soon as they are cooked enough, drain them well in a colander and chop them, but not too fine.
5 - Season with butter, salt and pepper.
6 - If desired, serve with vinegar.