1 (1 1/2 inch) piece fresh ginger root, chopped
1 tablespoon minced garlic
2 tablespoons ground turmeric
3 tablespoons chili powder
1/2 cup ground coriander
1/2 cup corn oil
1/2 teaspoon fenugreek seeds
1 (32 ounce) container plain yogurt
2 1/2 cups chopped fresh cilantro
2 tablespoons chopped green chiles
1 tablespoon salt
3 pounds skinless, boneless chicken breast halves - cut into cubes