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Export 5 ingredients for grocery delivery
Step 1
With the back of a fork, mash egg yolk with mustard to make a thick paste.
Step 2
Stir in chopped scallions and chopped egg white. Mix in salt and pepper as desired.
Step 3
Divide mixture on top of 2 slices of bread.
Step 4
Top with lettuce leaves, and cover with remaining slices of bread. Makes 2 sandwiches.