Heat the remaining 1 tablespoon oil in a large pot over medium heat. Add shallots, garlic and cumin; cook, stirring often, until tender and translucent, 4 to 5 minutes. Increase heat to medium-high. Add the roasted squash-dripping mixture, broth, water and salt; bring to a boil over medium-high heat. Reduce heat to medium-low; cover and simmer until the squash is very tender, about 10 minutes. Remove from heat.