brown or large green lentils, rinsed and picked over • vegetable broth or water • jalapeño pepper, stemmed, seeded and chopped • whole coriander seeds • cumin seeds • dried oregano • bay leaves • medium Yukon Gold, russet or red potatoes (1 1/4 pounds), scrubbed and cut into 1/2-inch dice • baby spinach, chopped • small butternut squash (1 pound), peeled, seeded and cut into 1/2-inch dice (about 3 cups) • olive oil • large onion, chopped •