Use buttery marcona almonds from Spain for a smoother, more mellow bite.
Preheat the oven to 450°F. Place asparagus in a single layer on a baking sheet lined with aluminum foil. Drizzle with olive oil, coating spears evenly, and sprinkle with salt and pepper. Toss to coat. Roast for 8-10 minutes—depending on thickness of spears—or until tender.
While the asparagus cooks, melt the butter in a skillet over medium heat. Add the almonds and stir frequently until the butter begins to turn light brown, about 3 minutes. Remove from the heat and add lemon juice and tarragon.
Toss the asparagus with butter and almonds and serve.