In a medium bowl, mix the shallot, tamari, sugar, fish sauce, lemongrass, oil, chile sauce, and salt. Cut any excess fat from the chicken. Add the chicken to the bowl and toss to coat. Let the chicken marinate while preparing the rice.
Make the ginger rice
In a small saucepan, bring water, ginger, and salt to a boil. Add the rice and return to a boil. Reduce the heat to low, cover, and cook until tender, 15 to 30 minutes. Turn off the heat and let stand at least 5 minutes. Fluff the rice with a fork, then mix in the tamari.
Grill the lemongrass chicken
Meanwhile, prepare a grill for direct-heat cooking over high heat. Clean and oil the grill grates.
Remove the chicken from the marinade and place on the grill rack, cover, and cook until springy to the touch and cooked through, with an internal temperature of 165°F (74°C), 4 to 7 minutes per side.
Divvy the rice among 4 warmed plates. Top with the chicken, sprinkle with scallions, and serve immediately.
Notes
*How do I mince lemongrass?
To mince lemongrass, pull off the outer layers to reveal the tender white inner core. Slice thinly crosswise, and then chop. Use a heavy knife because lemongrass is very fibrous.