Combine the oil, oregano, cumin, garlic, bay leaves and lime juice in a blender and blend until smooth. Put the steaks in a large baking dish, add the marinade, cover and refrigerate for at least 4 hours and up to 24 hours.
Prepare a charcoal grill on high heat for direct grilling. Remove the steaks from the marinade and sprinkle with salt and pepper. Grill on both sides until charred and cooked to medium-rare doneness, about 5 minutes per side. Remove to a cutting board and let rest 10 minutes. Slice against the grain into thin slices. Serve the meat with the Mango Steak Sauce and Tomato Escabeche. Garnish with cilantro leaves.
Heat the oil in a medium high-sided skillet over medium-high heat. Add the garlic and onions and cook until soft. Add the mango nectar, horseradish, honey, chile powder, maple syrup, mustard, Worcestershire and mangos and simmer until the mangoes are very soft and the mixture has thickened, about 15 minutes. Season with salt and pepper. Transfer the mixture to a food processor or blender and blend until smooth. Scrape into a bowl and let cool to room temperature.
Toss the cilantro, vinegar, lime juice, oil, sugar, tomatoes, onions and jalapeno in a large bowl. Season with salt and pepper.