地 is earth, 三 is three, and 鮮 is fresh or delicious (freshness is highly prized in food), so 地三鮮 is earth three fresh foods or more delectably three earthly treasures.
About This Dish
This is a popular Shandong dish consisting of eggplant, potatoes, and peppers deep-fried or stir-fried and coated in a sauce made with light soy sauce and Shaoxing wine.