Pre-heat oven to 425 and line a baking sheet with foil.
Place chicken wings in a large bowl and pat dry with a paper towel. Toss to coat with oil, salt, and pepper then place in a single layer on a prepared baking sheet. Bake chicken wings until golden brown and crispy, about 25-30 minutes.
While the chicken is baking, prepare the glaze: In a small pot over high heat combine the hoisin, soy sauce, rice vinegar, garlic, ginger, sambal oelek, and sesame oil. Bring up to a simmer then lower the heat. Heat on low until wings are done cooking.
Remove wings from the oven and brush with glaze on both sides. Sprinkle with scallions to serve.