Peppered Beef Tenderloin Crostini with Caramelized Onions

INGREDIENTS

• 1 center-cut piece of beef tenderloin, about
• 3 lb., well trimmed
• Salt, to taste
• 2 Tbs. coarsely cracked peppercorns
• 4 Tbs. olive oil, plus more for brushing
• 1 baguette, cut into 1/4-inch-thick slices
• Freshly ground pepper, to taste
• 1 red onion, diced
• 1 yellow onion, diced
• 1 garlic clove, minced
• 1/4 cup balsamic vinegar
• Chopped fresh tarragon for garnish