Step 1

Combine the lemongrass, fish sauce, soy sauce, chilies, chile flakes, turmeric, agave and salt in a bowl. Add the tofu cubes and turn to coat them evenly. Marinate for 30 minutes.

Step 2

Heat half of the oil in a medium to large non-stick skillet over moderately high heat. Add the onion and garlic and stir until fragrant, about 1 minute. Reduce the heat to low and cook until the onions are soft, about 3 minutes. Transfer to a plate and keep warm.

Step 3

Wipe the pan down and heat remaining oil over moderate heat. Add the tofu mixture and, using chopstick or wooden spoons, turn the pieces so they cook evenly, about 4 - 5 minutes. Add the onion mixture and cook, uncovered, for another 2 to 3 minutes. Add half the peanuts.

Step 4

Remove from the heat and transfer to serving bowls. Garnish with the remaining peanuts and cilantro and serve immediately over steamed brown rice.