Step 1

Chop the roast beef into large chunks (about 1-inch pieces).

Step 2

Place the roast beef chunks in a food processor fit with the metal blade. Pulse until the meat is finely chopped into small pieces (be careful not to take it too far and turn it into a paste; you still want it to have a nice texture).

Step 3

Transfer the chopped roast beef into a large bowl. Add the diced celery, onions, and mayonnaise; stir until well-combined.

Step 4

Season to taste with salt and pepper.

Step 5

Use to make sandwiches, or you can spread it on crackers.