Break ends off asparagus. Arrange spears on small baking sheet. Squeeze 1/2 lemon over. Drizzle with olive oil and toss with hands to coat. Sprinkle 1 teaspoon kosher salt and 1 tablespoon Za-tar seasoning over.
Place in 400 degree oven for about thirty minutes, stirring once in between, until done to your liking. Squeeze remaining lemon over before serving.