Use a 6-quart slow cooker. Put the vegetables into the bottom of the slow cooker and add the tomatoes and beans. Pour in the pesto and broth.
Cover, and cook on low for 8-10 hours, or until the vegetables have fully cooked and softened and flavors have melded completely.
Stir well and add frozen peas and a handful of spinach. Cook on high for another 10-15 minutes or until the peas are fully hot and the spinach has wilted.