1. Heat the olive oil in a large skillet over medium heat. Add the diced onion and cook until translucent, about 3-4 minutes.
2. Add the minced garlic and cook for an additional minute until fragrant.
3. Increase the heat to medium-high and add the ground beef. Cook until browned, breaking it apart with a wooden spoon, about 5-7 minutes. Drain any excess fat.
4. Stir in the soy sauce, hoisin sauce, rice vinegar, sesame oil, and ground ginger. Mix well to combine all the flavors.
5. Add the chopped water chestnuts and half of the green onions. Cook for another 2 minutes until heated through.
6. Season with salt and pepper to taste. If you love a bit of heat, now’s the time to add a dash of Sriracha or chili sauce.
7. Remove from heat and let it cool slightly. Spoon the beef mixture into lettuce leaves, garnish with the remaining green onions, and serve.

Cooking should be fun and flexible, so feel free to adjust the seasonings to suit your taste. Remember, it’s about feeding your people with love, not about getting it perfect every time.