Peel and coarsely grate the salsify (a food processor saves effort). In a large bowl, mix the salsify with the garlic, thyme and some salt and pepper. Add the flour and mix well, then pour in the beaten eggs and mix again.
Warm a generous knob of butter in a large frying pan over a medium heat. Form the mixture into fritters about the size of the palm of your hand and no more than 0.5cm