M&S Beef & Onion with peppercorn mayo on a sub roll

When I saw this, the pairing of beef & onion and peppercorn mayo looked good so I didn't hesistate getting it.

The beef slices in the sub looked like decent roast beef slices as well.

After warming it in the microwave for 25 seconds, the roll was simply amazing.

The fiery peppercorn mayo and sweet caramelized onions were so good together and then you have the quality beef slices so overall highly recommended.