Vegetable Spiral Tart with Avocado-Curry Cream

Name: Vegetable Spiral Tart with Avocado-Curry Cream
Yield: Serves 4 to 6
Ingredients: ½ cup plus 2 tablespoons (150 ml) heavy cream; 1 small clove garlic, pressed or grated; 1 teaspoon curry powder; 1 teaspoon caraway seeds; 1 avocado; Grated zest and juice of ½ lemon; ½ cup (125 ml) crème fraîche; About 1 pound (450 g) sweet potatoes, peeled; 1 egg; Sea salt and freshly ground black pepper; Sea salt and freshly ground black pepper; 3 large carrots (about 11 ounces/300 g), peeled; 2 parsnips, peeled; 1 eggplant; 2 eggs