Bread: Spread mayonnaise onto one side of each sourdough slice.
Assemble: Onto the other side of the bread, make one or two sandwiches by layering Chickpea Tuna Salad, tomato, and cheddar cheese.
Cook: Cook over medium heat in a large skillet or panini press until outsides are golden brown and cheese has melted. Alternatively, set the oven to broil and cook for 3 to 5 minutes. Serve immediately.
Notes
Make it vegan by using a plant-based cheddar and mayonnaise.