In a saucepan bring 2 inches of water to boiling. Add broccoli, return to boiling. Cook, covered, for 2 minutes or until broccoli is crisp-tender and bright green; drain. Rinse with cold water; drain well.
In same saucepan cook cauliflower in water using same method as Step 1.
In 2- to 2-12-quart bowl layer half the broccoli, cauliflower, raisins, and walnuts. Repeat layers. Cover and chill. In a screw-top jar combine olive oil, vinegar, 1 teaspoon salt, the honey, basil, black pepper, and red pepper. Cover tightly and shake well. Add dressing just before serving; toss to coat. Makes 10 (2/3-cup) servings.