Grilled Short Ribs with Lemon and Parsley

• 3 English-style bone-in beef short ribs (about 3½ lb.)

Kosher salt and freshly ground black pepper

• 1 medium sweet onion (such as Vidalia), thinly sliced
• ¾ cup fresh orange juice
• ⅓ cup fresh lime juice
• ⅓ cup olive oil
• ½ cup chopped fresh flat-leaf parsley, plus leaves for serving

Flaky sea salt (such as Maldon)

• 1 teaspoon finely grated lemon zest

1. Season ribs generously with kosher salt and pepper. Place in a shallow baking dish with onion, orange juice, lime juice, oil, and ½ cup chopped parsley; toss to coat. Cover and chill at least 3 hours.
2. Let ribs sit at room temperature 1 hour before grilling.
3. Prepare grill for 2-zone heat (for a charcoal grill, bank coals on 1 side of grill; for a gas grill, leave 1 or 2 burners off). Remove ribs from marinade, scraping off excess, and grill over direct heat, turning occasionally, until charred on all sides, 15–20 minutes.
4. Move ribs to indirect heat and grill, bone side down, until an instant-read thermometer inserted into thickest part registers 130° for medium-rare, 5–10 minutes (cooking past this point will yield tough meat). Transfer to a cutting board and let rest 10 minutes.
5. Cut meat from bone and slice thinly against the grain (this step is key for pleasantly chewy bites); season with sea salt and pepper. Serve topped with lemon zest and parsley leaves.
6. DO AHEAD: Ribs can be marinated 1 day ahead. Keep chilled.