Combine red wine vinegar, shallot, raspberries, raspberry preserves, and honey in a blender pitcher; blend until smooth.
With the blender running, slowly stream in the olive oil and blend until the dressing emulsifies. Season to taste with salt and pepper, then pour it through a fine-mesh sieve into a small pitcher, pressing with the back of a spoon to catch the seeds. (see recipe note #1)
For the Salad:
Add the spinach to a large salad bowl and lightly drizzle with dressing, just enough to coat (see recipe note #2). Toss gently to dress the leaves without bruising.
Add a touch more dressing if needed, then scatter the candied pecans, cheese, and raspberries over the top. Serve right away.
Notes
If you don't mind seeds, you can skip the step of straining them out.
Tossing the spinach by itself first keeps the toppings from sinking to the bottom. Start with a light coat of dressing; you can always add more once everything is assembled.
The recipe makes about ¾ cup dressing, so you may have extra. Refrigerate leftovers in an airtight container and use within one week.