Skinny Steak and Kale

Ingredients

• 2 (3/4-inch-thick) beef strip steaks
• 1 teaspoon kosher salt, plus more as needed
• 1/2 teaspoon ground black pepper, plus more as needed
• 1 tablespoon olive oil
• 2 tablespoons butter
• 1 large sweet onion, thinly sliced
• 1 bunch kale, stems removed and chopped
• 1 tablespoon red wine vinegar
• 1 teaspoon honey