Preheat your grill or grill pan over medium-high heat.

Pat the New York strip steaks dry with paper towels and season both sides generously with salt, black pepper, and cracked allspice.

In a large bowl, toss the trimmed green onions with olive oil, salt, and pepper until well coated.

Place the seasoned steaks on the grill and cook for about 4-5 minutes per side for medium-rare, or until your desired doneness is achieved. Remove the steaks from the grill and let them rest for 5 minutes.

While the steaks are resting, add the green onions to the grill. Grill them for about 2-3 minutes, turning occasionally, until they are charred and tender.

In a small bowl, combine the unsalted butter and minced black garlic, mixing until well blended.

To serve, place the rested New York strip steaks on a cutting board. Top each steak with a generous dollop of black garlic butter and garnish with grilled green onions and chopped parsley.

Slice the steaks against the grain and serve immediately.