Bhaji, or spinach, is very popular in Trinidad and the North American varieties commonly found in any American supermarket are favored over tougher local Trinidadian varieties.
In a large, wide frying pan, heat the oil until very hot. Add the onion and fry until translucent. Add the garlic and fry until golden brown, about 30 seconds.
Stir in the spinach. Cook, stirring constantly, until the spinach begins to wilt. Add salt and black pepper to taste, then add the coconut milk and 2