This fast recipe delivers slow-cooked flavor. Pumpkin is one of the few vegetables with a canned version that is quite good, saving you lots of time and effort. Just be sure you don’t accidentally grab pumpkin pie filling (which will contain added sugar and spices). The soup holds up well, so you can make it a day or two ahead; if it waters out a bit after being reheated, just give it a good stir with a whisk. Roasted almonds perform double duty here: They’re pureed into the soup to help…