This is the perfect make-ahead sandwich. Simply prepare it a day in advance, cover with plastic wrap, and keep it in your refrigerator. Toss it in your lunch bag with a piece of fruit for a simple lunch on the go!
Oxmoor House JANUARY 2005
Combine first 3 ingredients, stirring well. Spread mixture evenly over 1 side of each bread slice. Top half of bread with spinach, beef, and onion. Top with remaining bread slices. Cut sandwiches in half to serve.
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