Saffron and cardamom caramel cream

Ingredients :

 60 cl of milk (2 + 2/5 cups)
 115 g sugar powder (4 oz) (+ 4 tablespoons for caramel)
 1 pinch of saffron pistils
 1/2 teaspoon (coffee) of cardamom seeds
 1 or 2 tablespoons (table) of rose water
 4 slightly beaten eggs
 6 cl boiling water (1/4 cup)