Preheat oven to 425 degrees and line two baking sheets with parchment paper.
Cut bottom and edge of squash, and using a vegetable peeler, remove skin. Slice in half lengthwise, scrape out seeds with a spoon and slice horizontally into 1/4- to 1/2-inch strips. Arrange squash slices in a single layer on two sheet pans. Drizzle 1/3 cup of olive oil over squash, then flip pieces so that they're olive-oil side down. Season with salt, pepper, and rosemary, and roast until tender and undersides are browned, about 20 minutes. Allow squash to cool on pan, then place on serving dish.
For the vinaigrette, whisk together minced garlic, lemon juice, sherry vinegar, mustard, pollen, and salt and pepper in a medium-sized bowl. Drizzle in remaining olive oil and whisk until
emulsified. Pour vinaigrette over squash and sprinkle with parsley and raisins.