This recipe combines two of my favourite ingredients: Tamarind and De Arbol Chillies. Tamarind is very prevalent in Mexican sweets and in the cooking of the pacific regions in Mexico; it arrived during Colonial times and soon established itself as an easy crop that required little or no work. The bittersweet and tangy taste is a favourite of most Mexicans. You can buy the fresh pods, or buy the pulp with or without seeds; mixed with sugar or with sugar and chilli. It makes delicious 'aguas frescas' (a cold drink), sweets and snacks.