Roasted Oysters with Green Tomato Pickle and Cranberry-Horseradish Relish

Ingredients

• 1 ¹⁄₂ lb. green tomatoes, cored and finely chopped
• 1 small yellow onion, minced
• 2 tbsp. kosher salt
• ³⁄₄ cup apple cider vinegar
• ¹⁄₂ cup packed light brown sugar
• 1 tsp. whole black peppercorns
• 1 tsp. mustard seeds
• ¹⁄₂ tsp. whole allspice
• ¹⁄₂ tsp. cumin seeds
• ¹⁄₂ tsp. celery seeds
• 4 whole cloves
• 2 cloves garlic, minced
• 2 bay leaves
• 2 dried chiles de arbol
• 1 cup fresh or thawed, frozen cranberries
• 1 small yellow onion
• 1 lb. fresh horseradish, peeled and finely grated
• 1 cup honey
• 1 tsp. kosher salt
• ¹⁄₂ tsp. ground cinnamon
• ¹⁄₄ tsp. freshly grated nutmeg
• 2 medium carrots, finely grated
• 1 small red beet, peeled and finely grated
• 1 large Granny Smith apple, peeled and finely grated
• 1 1"-piece ginger, peeled and finely grated
• 50 oysters in their shells, scrubbed clean