Grilled Herb-Rubbed Wagyu Flat Iron with Roasted Onion Raita

Ingredients

• 3/4 cup firmly packed fresh cilantro leaves and steams, separated
• 1/2 cup firmly packed fresh mint leaves
• 3 cloves garlic
• 2 serrano or jalapeno chiles, stem and seeds removed, divided
• 1-inch length fresh gingerroot, unpeeled and sliced into fourths
• 1 Tbsp olive oil
• 1-3/4 tsp salt, divided
• 1 tsp garam masala
• 1 small red onion
• 1 tsp sugar
• 3/4 cup plain whole milk yogurt