In a small bowl, stir together the yogurt, garlic and cumin. In a separate bowl combine the coriander seeds, curry, salt and pepper.
In a very large nonstick skillet or sauté pan, heat the oil over medium-high heat. Meanwhile, dip the tofu into the yogurt mixture to lightly coat each side, then sprinkle each side with the curry mixture, dividing the seasoning evenly among all the tofu.
Immediately place tofu in the hot pan and cook until just done, about 2½ minutes on each side. Serve with a light sprinkling of chopped mint.