Grilled London Broil with Cilantro Buttermilk Marinade

What a nice Memorial Day weekend.  Tons of yard work - lots of Aleve but also lots of great new recipes to try - Love grilling outside - it was such a hot weekend!

• 1 cup buttermilk
• 1 bunch cilantro roughly chopped
• 1 teaspoon coriander seed
• 1/2 teaspoon curry powder
• 3 scallions roughly chopped
• 1 pound london broil , cut into 4 pieces
• vegetable oil, for grilling
• salt and pepper
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• 1. In a blender, combine buttermilk, cilantro, coriander seed, curry powder, and scallions and puree.  Reserve 1/2 cup marinade for serving.  Pour half the remaining marinade into a shallow dish, arrange steak in a  single layer, and cover with rest of marinade ; let sit 30 to 45 minutes.
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• 2. Heat a grill or grill pan to medium-high.  Clean and lightly oil hot grill.  Remove steak from marinade, shaking off excess, and season with salt and pepper.  Grill steak until browned, 3 to 4 minutes per side for medium-rare.  Transfer to a cutting board and let rest 5 minutes before thinly slicing against the grain.  Season reserved marinade with salt and pepper and serve with sliced steak.