Beef Tenderloin Canapés

INGREDIENTS

• 1 1/2-lb. piece beef tenderloin, trimmed of fat and sinew
• 1 Tbs. chopped brined green peppercorns
• 1 Tbs. chopped fresh tarragon
• 2 green onions, white and light green portions, chopped, plus sliced green onion for garnish
• 1/2 tsp. coarse salt
• 3 Tbs. olive oil
• 24 baguette slices, each 1/4 inch thick
• 1/2 cup whipped cream cheese, at room temperature
• 2 Tbs. prepared horseradish