Combine the salt, pepper, thyme, rosemary and garlic. Rub it over the top of the tri tip.
Place the meat into a 6 qt. slow cooker.
Add the broth and Worcestershire sauce to the slow cooker around the sides of the meat. Do not pour directly over the top of the tri tip and wash off the seasoning.
Cover and cook on low for 6-7 hours or until the meat is tender, and pulls apart easily with a fork.
Remove the meat from the slow cooker and shred or cut into pieces.
Strain the remaining liquid and use it as an au jus if making sandwiches.
For Sandwiches.
Butter and toast buns.
Place meat on top of bottom bun, cover with a slice of cheese and place under broiler to melt cheese.
Serve with au jus.
Video
Notes
When cooking beef in the slow cooker I always try and cook it on low for the best results. If you just don't have time and need to cook it on high, cook for 4-5 hours or until the meat is tender and pulls apart easily.
T0 make in the Instant Pot: Prepare the tri tip as the recipe states then place in Instant Pot. Add in the liquid. Cook on manual high pressure for 25 minutes. Do a quick release.