From Rob Cockerham's sandwich calculations:
Dijon mustard is to yellow mustard as a Rolls Royce is to your Honda. A 454 gram bottle sells for $6.99, and that is 5 cents per serving.
He adds up exactly how much homemade sandwiches cost based on the amount of ingredients and their correlating prices. The results are revealing: 98 cents for a processed turkey sandwich, 48 1/2 cents for a grilled cheese, and 64 cents for a pb&j. If you'd like to figure out how much bread you'll need for your picnic, try out Cockerham's sandwich calculator. For more dizzying and delicious equations, cut the corners off the drool-inducing Scanwiches.