Preheat the oven to 475 degrees.
In a heavy roasting pan, combine the vegetables
and olive oil and toss to coat. Roast 20 to 30 minutes, turning every 10 minutes, until the vegetables are nicely browned.
Meanwhile, tie the herbs together with kitchen string. Transfer the pan to the top of the stove. Add the wine, stock, tomatoes, and herbs and cook over high heat for 15 minutes. Stir in the Swiss chard and cook 2 minutes more.
Season with salt and pepper. To serve, spoon the vegetables and sauce over the polenta.