Step 1 In a wide bowl, toss together the tomatoes, balsamic vinegar, garlic, olive oil, ¼ teaspoon salt and several grinds of pepper, and mint or basil. Taste, adjust the seasoning as desired, and set aside for 15 minutes to give the flavors time to develop.
Step 2 Use the shredder blade on the spiralizer to prepare the celeriac while you bring a large pot of salted water to a boil. Take up handfuls of the shredded celericac and cut long strands into manageable lengths using a scissors.
Step 3When ready to serve, add the celeriac noodles to the boiling water and boil quickly to soften, 30 seconds to 1 1/2 minutes. Drain and toss with the tomato sauce and feta. Serve warm or room temperature.