1. Cut off and reserve 2 tablespoons feathery fennel fronds for garnish. Chop enough fennel bulb to yield 1 cup. Heat oil in a large saucepan over medium heat. Add chopped fennel; cook 4 minutes, stirring occasionally. Stir in garlic; cook 1 minute. Add broth and pasta; then bring to a boil over high heat. Reduce heat and simmer uncovered 5 minutes.
2. Stir in vegetable juice, diced tomatoes, beans, peas, and if desired, pepper flakes. Return to a simmer; cook 10 minutes or until pasta and fennel are tender, stirring occasionally. Ladle into shallow bowls; top with fennel fronds and feta cheese.

Tips and Substitutions: Chicken broth may replace the vegetable broth. Cannellini or great northern beans may replace the navy beans, and goat cheese may replace the feta cheese.