Mix soy sauce, vinegar, sugar, and water in a small bowl. Set aside.
Sear the eggplant in a thin layer of oil over medium-high heat. The eggplant doesn’t need to be fully cooked yet. Remove and set aside.
In the same pan over medium heat, add another tablespoon of oil and sauté garlic until lightly golden and fragrant. Don’t let it burn.
Return the eggplant to the pan and pour in the sauce. Stir gently until the eggplant is coated.
Cover and lower the heat. Cook the eggplant until they soften and soak up the sauce, about 2 minutes. Turn off the heat.
Notes
Eggplant: Japanese or Chinese eggplants (long and thin) work best. Globe eggplants (big and round) also work but can taste bitter—salt slices for a few minutes, then rinse before cooking.
Soy sauce: Regular or low-sodium both work. Salt levels vary by brand, so taste and adjust.
Storage
Refrigerate: Let cool, then store in an airtight container for up to 3 days.
Reheat: Warm in a pan over low heat or in the microwave. Add a splash of water if needed.
Cooking Tips
Don’t overcrowd the pan or the eggplant will steam instead of brown.
Watch the soy sauce — brands vary, so taste as you go.
Keep the heat low after covering so the eggplant cooks through without burning.