To prepare a stuffed kohlrabi with tomatoes and feta cheese recipe, you will first need to prepare your ingredients. You will need: 1 pound (240 g) of fresh, unpeeled, halved and quartered tomatoes. 2 tablespoons (60 ml) kosher salt. 1 teaspoon (2.5 tbsp) olive oil. 1/2 cup (120 milliliters) chopped fresh thyme. Salt and pepper to taste. Cut the stalks off the stems of each of the 2 large, round, 1-inch (2.54-centimeter) long, 2-inch (5.1 cm) wide, long-legged, bulbous, green, orb-shaped, white or yellow radishes. Slice each stalk in half lengthwise, and cut each half crosswise into 12-inch (0.64-cm) thick slices. Place the slices on skewers and grill until they are charred on each side, about 5 minutes. Remove from the grill and set aside to cool. To make the filling, mix together 1 tablespoon (1.25 c) grated Parmesan cheese with 2 teaspoons each sour cream and parsley. Add the cheese mixture to the sliced rotisserie chicken and toss to coat. Cover the chicken with plastic wrap and refrigerate until firm, at least 1 hour.