Combine marinade ingredients in a medium size bowl. Add ground beef, mix well. Set aside and let stand 10 minutes.
Heat oil in skillet over high heat until starting to sizzle.
Add garlic. Cook 10-12 seconds.
Lower heat to medium-high. Add beef WITH the marinade. Fry 2-3 minuts until meat has browned. Remove from skillet with a slotted spoon making sure to drain well. Set aside.
Make a slurry with cornstarch and water.
Heat remaining oil in skillet over high heat, add corn and cook, stirring for 3 minutes.
Add cornstarch and salt, stirring for 1-2 minutes.