Ingredients

• 2 cups buttermilk
• 1/4 cup mustard (use your favorite, I use Dijon)
• 3 -4 garlic cloves, smashed
• 2 tablespoons low sodium soy sauce
• 2 tablespoons extra virgin olive oil
• 2 teaspoons paprika
• cayenne pepper (a few grains)
• 1/2 teaspoon dried marjoram
• 2 (1 1/2 lb) lean flank steak, trimmed
• vegetable oil cooking spray
• 1 1/4 cups plain low-fat yogurt
• 1/4 cup red wine vinegar
• 2 tablespoons Dijon mustard
• 1 tablespoon grated parmesan cheese
• 1 tablespoon extra virgin olive oil
• 2 garlic cloves, smashed
• 1/4 teaspoon dried marjoram
• 1/8 teaspoon salt
• 1/8 teaspoon cayenne pepper