Prep: 15 minutes. Use half of a 16-ounce loaf of sliced French bread, or slice the loaf yourself into 3/4-inch-thick slices.
Combine first 7 ingredients in a small bowl; stir with a whisk.
Spread mayonnaise mixture evenly on 4 slices of bread (about 2 tablespoons per slice). Place 1/4 cup spinach leaves on each bread slice; top each with 2 slices tomato. Top with remaining bread slices.
Cooking Light Superfast Suppers
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