For the steak:
- 2 tablespoons cornstarch
- 2 tablespoons water
- 1 ½ pounds stir fry beef strips
- 2 tablespoons olive oil
- 8 garlic cloves crushed
- 1 red onion thinly sliced
- ⅓ cup oyster sauce
- 3 tablespoons mirin or other rice-based cooking wine
- 2 tablespoons sugar
- 2 tablespoons soy sauce
- 1 tablespoon fish sauce
- 2 teaspoons coarsely ground black pepper
For the dipping sauce:
- 1 teaspoon coarsely ground black pepper
- 2 limes juiced
- 1 teaspoon coarse sea salt
For serving: butter lettuce leaves, cucumber, tomato, cooked white rice