Arrange the asparagus on a small rimmed baking sheet. Drizzle with 2 teaspoons oil and sprinkle the seasoning blend over. Toss to combine.
Heat the Blackstone or other outdoor griddle to medium. Brush the remaining 2 teaspoons oil on the surface of the griddle.
Add the asparagus to the hot griddle in a single layer and cook, stirring frequently, until it's bright green and crisp tender, 3 to 4 minutes.
Serve hot, with lemon wedges for squeezing over.
Notes
Size matters--The cooking time will be dependent on the thickness of your asparagus spears. Thin ones will cook quickly, in about 3 minutes, while very thick ones may take up to 5 minutes.
Dietary--This griddled asparagus recipe is suitable for gluten-free, dairy-free, and vegan diets.