Heat oil and fry the garlic until golden.
Add onions fry until tender.
Add the chicken, grated ginger, green chillies, fry until golden.
Now add the ground masala paste and stir fry for 5 to 7 minutes.
Add the tamarind, water, stevia, salt and chilly powder.
Cook on slow heat till you get a gravy and chicken is tender.
Garnish with fresh coriander.