01 - Heat a non-stick skillet over medium heat. Add sliced shiitake mushrooms and sauté for 5-6 minutes, stirring occasionally, until tender. Remove from heat and set aside to cool completely.
02 - Slice avocado, julienne carrot and cucumber, thinly slice red bell pepper, and chop scallions. Arrange all prepared vegetables, spinach, and herbs within easy reach of your workspace.
03 - Fill a shallow dish with warm water. Dip one rice paper sheet into the water for 10-15 seconds until just pliable. Carefully lay it 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. Layer with avocado slices, sautéed shiitake mushrooms, carrot, cucumber, bell pepper, scallions, and a sprinkle of fresh herbs.
05 - Fold the bottom edge of the rice paper over the filling. Fold in both sides, then roll forward tightly to seal. Repeat with remaining ingredients to make 8 spring rolls.
06 - 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.
07 - Serve spring rolls immediately, whole or sliced in half, with dipping sauce on the side. For best results, consume within 2 hours of preparation.