Heat vegetable oil in a wok or large skillet over medium-high heat; cook and stir okra until tender and golden brown, about 3 minutes. Transfer okra to a plate.
Sprinkle turmeric into hot oil; heat until turmeric becomes aromatic, 1 to 2 minutes. Add garlic, ginger, onions, and tomatoes; cook and stir until onions are tender, about 10 minutes. Stir okra into onion mixture. Garnish with cilantro.