Calabaza en Tacha / Calabaza dulce
pumpkin (about 700 grams), preferably calabaza de Castilla or similar • sweet potatoes (about 1 kg), use a mix of yellow and purple if available • large piloncillo cones (or 2 cups packed dark brown sugar, about 400 grams) • water (710 ml) • large cinnamon stick • whole cloves • Milk, to taste, for serving