Place the meat in a bowl and sprinkle with the turmeric.
In a large mortar or a food processor, combine the lemongrass, garlic, shallots, ginger, and salt and pound or pulse until they become a rough paste. Add the rice, cayenne, and tomatoes and pound or pulse again. Add the paste to the meat and mix well, kneading them together.
Shape the mixture into balls about 1 inch in diameter, then gently press each into a thick patty.
Place a heavy skillet over high heat. Add the peanut oil, lower the heat very slightly, and then add the patties. (If the patties release water, raise the heat to evaporate it.) Cook for 2 to 3 minutes per side, or to your desired doneness.