Tamarind Sorbet and Coconut Ice Cream Sundae with Macadamiachipotle Brittle

The many delicious components in this sundae—tamarind sorbet and coconut ice cream dressed with rum-brown sugar syrup and macadamia-chipotle brittle—add up to a yummy and intricate dessert. You can prepare them ahead (and even cheat with purchased ice cream) and then assemble the sundae just before serving. When making piloncillo syrup, if the brown sugar cone is grated, as the recipe states, then the 7 to 8 minutes cooking time is correct. However, when it is coarsely chopped, it could tak