Step 1

In a small bowl, stir together the mayonnaise, chives and 2 teaspoons of juice from the lemon; reserve the rest of the lemon. Season the mayonnaise liberally with salt and pepper.

Step 2

Place the bread slices on a cutting board and divide the mayonnaise among the slices. Layer 2 cheese slices each on two pieces of bread, then fan out half an avocado's worth of slices on each of the other two pieces of bread.

Step 3

Using a vegetable peeler, mandoline or a knife, thinly slice/shave the cucumber lengthwise into ribbons. Layer half the cucumber ribbons over each stack of avocado slices. Pile half the sprouts over the cucumber ribbons, then sprinkle the sprouts evenly with the scallions.

Step 4

Give the reserved lemon halves a squeeze over the sprouts to give them a little juice and season with salt and pepper. Close the sandwich and eat with some salty potato chips.