Combine first 7 ingredients in a small bowl. Place a lettuce leaf on half of each English muffin. Top evenly with tuna salad. Top with remaining English muffin halves.
To enhance browning when toasting gluten-free English muffins, coat the muffins with cooking spray, and then toast them in a toaster oven or underneath a broiler to get the best browning results.
Cooking Light Gluten-Free Cookbook