Vietnamese Grilled Lemongrass Pork Chops

Name: Vietnamese Grilled Lemongrass Pork Chops
Ingredients: 1/2 cup neutral oil, such as vegetable or avocado, plus more for the grill or pan; 3 tablespoons granulated sugar, plus more as needed; 3 tablespoons fish sauce, plus more as needed; 1 stalk fresh lemongrass, or 2 tablespoons lemongrass paste; 1/2 medium shallot; 6 cloves garlic; 2 pounds (1/2 to 3/4-inch thick) bone-in pork chops (4 to 6); Nuoc Cham (see recipe below); 1 medium cucumber; 1 small tomato; 1 medium lime; 3 medium scallions; 1/4 cup olive oil; Green leaf lettuce leaves; Cooked jasmine white rice, preferably broken short grain