Crab Paste Grilled Rib Eye

Name: Crab-Paste-Grilled Rib Eye
Ingredients: 6 Tbsp. vegetable oil, divided, plusmore for grill; 1 1¼-lb. bone-in rib eye (about1½ thick); Kosher salt, freshly ground pepper; 1 lb. yu choy or bok choy, halvedlengthwise if large; 2 scallions, cut into 1 pieces; 2 garlic cloves, crushed; 1 lemongrass stalk, bottom third only, tough outer layers removed, chopped; 1 3 piece ginger, peeled, thinly sliced; ½ cup crab or shrimp paste