Mix together each of the ingredients in a bowl, except the salt, pepper, chili flakes, coconut oil and skewers.
Let marinade in the refrigerator for an hour.
Thread the beef on the bamboo skewers.
Pre-heat a grill.
Season the beef with salt, black pepper and chili flakes (or, instead, add a bit of Thai chili paste to the marinade!)
Once the grill is hot, brush it with coconut oil and quickly place your beef on the grill.
Grill each skewer, until it's nicely seared and cooked to your desired doneness.