Chop vegetables and thyme, roast spices (except nutmeg) until fragrant, then grind very fine in a grinder. Add everything (except tofu) to food processor or blender and blend for about 45 seconds or until desired consistency. Cut tofu into 1 squares and marinate overnight. Soak bamboo skewers in water for a couple of hours, then skewer tofu and grill on medium to medium-high heat while basting with remaining marinade and turning frequently for about 15-20 minutes.