3 tablespoons vegetable oil, divided
1 1/2 pounds beef chuck, cut into 1" pieces
Kosher salt
1 teaspoon coarsely ground black pepper plus more for seasoning
5 garlic cloves, chopped
3 serrano chiles, seeded, chopped
1 1x1-inch piece ginger, peeled, thinly sliced
1 teaspoon ground turmeric
3 cups low-salt chicken broth
1/2 pound small carrots, scrubbed or peeled, halved lengthwise
1/2 pound baby red-skinned potatoes (about 1 1/2"-diameter), halved, or quartered if large
1/4 pound frozen, thawed pearl onions, halved
2 cups canned unsweetened coconut milk
Cilantro sprigs