In a dish, whisk together BBQ sauce, fresh parsley, sherry vinegar, soy sauce, dried oregano, dried rosemary, dried thyme, chopped garlic, and extra-virgin olive oil to create the marinade.
Place the flank steak into the marinade, ensuring it is well coated on both sides.
Cook the marinated flank steak on a heated grill pan until done to your liking.
Peel the sweet potatoes and cut them into 2-inch chunks. Boil in salted water until tender, then drain and return to the pot.
To the tender sweet potatoes, add unsalted butter, maple syrup, orange juice concentrate, ground cinnamon, kosher salt, and freshly ground black pepper. Mash until combined.
Slice the cooked flank steak against the grain. Serve alongside the mashed sweet potatoes and garnish with chopped fresh chives.
Cook it hands-free.
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