Preheat grill for two-zone grilling, one medium and the other side medium-high. Brush grill grate with oil. Puree all chimichurri ingredients in a food processor, and season with salt and pepper, set aside. Toss potatoes with 2 tbsp oil; thread six potatoes onto each of four skewers so they lay flat (use grill cage for this instead) Toss beef with remaining oil (and season with salt & pepper). Evenly divide and thread beef onto four skewers. Grill potatoes, covered, over medium heat until brown and soft, about 7 minutes per side. Grill kebabs about 3 minutes per side for medium rare; let rest, brush with chimichurri while resting and serve with the rest of the sauce.
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