Steps
1. Heat olive oil in a pan over medium heat.
2. Add minced garlic, grated ginger, and sliced onions; sauté until onions are soft and caramelized, about 5-7 minutes.
3. Increase heat to medium-high, add beef slices, salt, pepper, and soy sauce if using.
4. Cook beef until browned and cooked through, about 3-4 minutes.
5. Meanwhile, butter one side of the bread slice and toast it in a separate pan until golden and crisp.
6. Place the cooked beef mixture on the toasted bread.
7. Optionally, top with fresh greens or cheese if desired.
8. Serve immediately and enjoy your savory garlic ginger beef sandwich.