Preheat oven to 400 degrees F. In a bowl, toss broccoli with 1 1/2 tablespoons olive oil and 1/2 teaspoon salt. Spread onto a baking sheet. Then toss cauliflower with 2 tablespoons olive and 1/2 teaspoon salt. Spread onto another baking sheet.
Add sheet pans to oven and bake for 20 minutes, turning once. Remove broccoli, which should be golden brown, and set aside. Bake cauliflower for another 15 minutes, until golden and tender. Remove and set aside.
Melt butter on stovetop with sage, and warm for 5 minutes, so butter is infused.
Combine cauliflower and broccoli in a bowl, then pour on butter and lemon juice. Toss with your hands, lightly. Add seeds, golden raisins and lemon zest, lightly toss again. Pour onto serving platter and enjoy.