Prep: 30 mins
| Cook: 15 mins
| Extra time: 1 hour, marinating
Mix the first six ingredients in a large, resealable plastic bag. Shake. Season the steak with salt and pepper, then add the meat to the bag. Seal and refrigerate. After 1 hour, remove the meat from the bag.
To make the dressing, combine all of the ingredients *except the oil* in a bowl. Whisk until the salt dissolves, then add the oil in a slow steady stream, whisking until well-mixed with the other ingredients.
Heat the grill to medium-high.
Rub potatoes with oil and season with salt and pepper. Set aside.
Mix cabbage, cilantro, vanilla, and bell peppers in a bowl. Drizzle with dressing, and reserve.
Grill steak to desired doneness (2 minutes on each side for rare), then remove from grill and slice against the grain into 12 slices. Meanwhile, grill the potatoes until they are seared and hot (about 5 minutes).
Put everything on a plate and drizzle with more of the dressing.