Oysters on the Half-Shell with Scallops, Horseradish, Lime and Golden Osetra Caviar

INGREDIENTS

• 40 oysters, well scrubbed and rinsed
• 7 large fresh sea scallops, each cut
• horizontally into 6 thin slices
• 3 limes
• 4 tsp. freshly grated horseradish
• 6 drops Tabasco sauce
• Freshly ground pepper, to taste
• Coarse salt, to taste
• 4 small pink radishes, thinly sliced crosswise
• 6 oz. golden osetra caviar
• 1 celery heart, tender yellow leaves only