Ginger Flank Steak with Wasabi Smashed Potatoes

Name: Ginger Flank Steak with Wasabi Smashed Potatoes
Ingredients: 2 inches fresh ginger root, peeled and grated; 1/4 cup tamari aged soy sauce; 2 limes, zested and juiced; 3 tablespoons vegetable oil, eyeball it; 2 tablespoons grill seasoning (recommended: Montreal Steak Seasoning by McCormick); 2 pounds flank steak; 2 1/2 to 3 pounds Idaho potatoes, 4 large potatoes, peeled and cut into chunks; Salt; 1/4 to 1/3 cup cream; 1 to 2 tablespoons wasabi paste - how hot do ya like it?; 4 scallions, root end trimmed; Handful cilantro leaves