Peel the salsify under cold running water, cut into cubes and immediately mix with the lemon juice. Heat the butter in a frying pan, sauté the salsify for approx. 5 mins., season.
In a bowl, mix the flour with all the ingredients up to and including the pepper. In a second bowl, mix the eggs with all the ingredients up to and including the olive oil. Add the egg mixture to the flour along with the Gruyère, parsley and salsify, mix well. Transfer the mixture to the prepared muffin tin holes and fill to just below the rim. This ensures that the muffins will be the perfect shape once baked.
Cut the ham into small pieces, scatter on top of the muffins. Bake for approx. 25 mins. in the centre of an oven preheated to 200°C.