Beef Satay with Ginger Dipping Sauce

INGREDIENTS

• 1 cup soy sauce
• 1/4 cup mirin
• 5 Tbs. Asian sesame oil
• Juice of 1 lime
• 1 to 2 Tbs. honey
• 2 Tbs. peeled and minced fresh ginger
• 5 garlic cloves, minced
• 1 Thai chili, finely sliced (optional)
• 2 lemongrass stalks, white portion only, finely diced
• Zest and juice of 1 lemon
• 2 green onions, white portion only, finely diced
• 2 Tbs. light brown sugar, firmly packed
• 1 flank steak, 1 1/2 to 1 3/4 lb., trimmed of excess fat
• Salt and freshly ground pepper, to taste
• Toasted sesame seeds for garnish (optional)