In a small bowl, add coffee, Truvia Brown Sugar Blend, black pepper, coriander, oregano, and salt; mix well.
Place the London broil on a cutting board or large plate. Drizzle 1/2 teaspoon of olive oil on each side of the meat, then rub it all over. Sprinkle the seasoning mixture over the London broil and rub it in to evenly cover the meat.
Grill the London broil to desired doneness, about 3–5 minutes per side for medium-rare. Tent the meat with foil for 5 minutes then slice it into very thin slices, cutting on an angle and against the grain.