Lightly coat a medium saucepan with cooking spray; heat saucepan over medium-high heat. Add mustard seeds, cumin seeds, and fennel seeds; cook and stir for 30 seconds. Add Brussels sprouts, chicken broth, ginger, salt, and crushed red pepper.
Bring to boiling; reduce heat. Cover and simmer for 10 to 12 minutes or until Brussels sprouts are tender, stirring occasionally. Stir in nuts and vinegar. Makes 4 servings.