Pour boiling water over the raisins and set aside to soak for about 10 minutes.
Peel the sweet potato, then use a specialty vegetable peeler with ridges to cut the sweet potato into thin strips. Transfer to a bowl, season with salt and pepper, drizzle with lime juice, maple syrup, and olive oil. Mix.
Add pumpkin seeds, sunflower sprouts, and drained, soft raisins. Mix and transfer to plates. Arrange halved romaine lettuce and peeled avocado alongside. Sprinkle with chili flakes. The lettuce and avocado can be additionally seasoned with salt and drizzled with olive oil and lime juice.