large eggs • sugar (about 67 grams) • unsweetened whole milk (or sweetened, if preferred) (each about 6.8 fl oz/200 ml, total 13.5 fl oz/400 ml) • sweetened condensed milk (optional) (about 4.5 tablespoons or 130 grams) • Water • Use glass or ceramic jars, bowls, or containers with lids to hold the flan (avoid using plastic containers)