Marinade:
Plop the yogurt into a medium bowl.
Add the lemon juice, salt, garlic, coriander, cumin, turmeric and chili peppers. (If you don't have chili peppers, you can substitute Tabasco).
Mix it all up,
Then remove the skin from the thighs and legs of the chickens.
Fold the wing flaps into neat little triangles.
Cover the bottom of a deep bowl with a dollop of marinade, drop in some chicken, then some more marinade, until all the chicken is immersed.
For the best results, cover and marinate in the refrigerator for 24 to 48 hours.
When the coals are ready, remove the chicken from the marinade. It should be well-coated.
Grill the chicken indirectly over the coals for 40-45 minutes, turning every 10-15 minutes. Baste with the marinade. Grill another 10 minutes. Turn, baste and grill until the chicken is crisp and toasty, about 15 minutes.