[Homemade] Churrasco with Chimmichuri and Cuban style black beans

Its my first time making this as its hard to find decent skirt/flank steak where i live. I came across a MB 4 angus flank and it came out great, tender and flavorful with a 3 hour marinade. The thicker parts were slightly undercooked to my liking but a quick toss in the pan after it was sliced made up for it.

Any tips on how i can improve?