01 - Heat a non-stick skillet over medium heat. Add sliced shiitake mushrooms and sauté for 5-6 minutes, stirring occasionally, until tender. Set aside to cool.
02 - Prepare all fresh vegetables including avocado, carrot, cucumber, bell pepper, spinach, scallions, and herbs. Arrange them within easy reach for assembly.
03 - Fill a shallow dish with warm water. Dip one rice paper sheet in the water for 10-15 seconds until just softened, then carefully lay flat on a clean kitchen towel or cutting board.
04 - Place a small handful of spinach or lettuce in the center of the rice paper. Top with avocado slices, sautéed shiitake mushrooms, carrot, cucumber, bell pepper, scallions, and fresh herbs. Fold the bottom over the filling, fold in both sides, and roll tightly to seal. Repeat with remaining ingredients to make 8 rolls.
05 - Whisk together soy sauce, rice vinegar, sesame oil, maple syrup, grated ginger, and minced garlic in a small bowl until smooth. Add water as needed to reach desired consistency.
06 - Serve spring rolls immediately, whole or sliced in half, with dipping sauce on the side.