Step 1

Cut beef into large pieces. Place beef into the slow cooker.

Step 2

Add celery, onion and capsicum.

Step 3

In a separate bowl, combine tomato sauce, tomato paste, brown sugar, vinegar, chilli, lemon juice, molasses, salt, Worcestershire sauce and mustard powder.

Step 4

Pour over beef.

Step 5

Cover and cook on low for 8 hours.

Step 6

Remove meat and shred with a fork. Place meat back into the sauce.

Step 7

Toast the rolls, or place under a hot grill for a few minutes.

Step 8

Serve beef on rolls using a slotted spoon. Sprinkle grated cheese on top, if desired.