Living here in the U.S., I've only actually seen Scorzenera once... it's quite rare, at least here. However it is closely related to Salsify, which is available at times. Here's a recipe I've used for Salsify and friends tell me it works well for your root plant as well:
4 large salsify
1 lemon, juice of
1 teaspoon peppercorn
5 sprigs thyme
1 bay leaf
1 teaspoon coriander seed
2 tablespoons extra-virgin olive oil
1 tablespoon butter
salt and black pepper, to taste
Directions
Peel the salsify, place in saucepan and cover with water; add lemon juice, peppercorns, 3 sprigs of thyme, bay leaf, coriander, and salt to taste.
Bring to a simmer and cook until tender.
Remove salsify from liquid and cool, cut into small pieces of equal size.
Heat heavy skillet over medium heat and add olive oil.
Add salsify and season with salt and pepper.
Cook until golden brown.
Add the butter and the remaining sprigs of thyme and toss until the butter melts.
Remove from heat and drain well on paper towels.
Enjoy!