Preheat your outdoor grill to high heat and preheat your oven to 400°F.
Slice the sweet potato into thick wedges, toss them with avocado oil and a pinch of sea salt, and roast on a parchment-lined baking sheet for 25 minutes until caramelized.
While the potatoes roast, prepare the chimichurri by finely mincing the parsley, cilantro, and garlic.
In a small bowl, whisk the minced herbs and garlic with the olive oil, red wine vinegar, and red pepper flakes until well combined.
Season the skirt steak generously on both sides with sea salt and black pepper.
Place the steak on the hot grill and cook for 3 to 4 minutes per side for medium-rare, adding the asparagus to the grill during the last 5 minutes of cooking.
Remove the steak from the grill and let it rest on a cutting board for at least 5 minutes to allow the juices to redistribute.
Thinly slice the steak against the grain and serve topped with a generous spoonful of the spicy chimichurri, alongside the roasted sweet potatoes and grilled asparagus.