Slow Cooker Jackfruit Joes

1 tablespoon vegetable oil
1/2 cup diced onion
1/2 cup diced red bell pepper
1 (16 ounce) can green jackfruit in brine, drained
2 cups plain tomato sauce
2 tablespoons brown sugar
1 1/2 tablespoons brown mustard
1 tablespoon tomato paste
1 tablespoon Worcestershire sauce
1 tablespoon sriracha sauce
1 teaspoon white vinegar
1/2 teaspoon garlic powder
1/2 teaspoon dried parsley
salt and ground black pepper to taste
6 hamburger buns

Turn on a multi-functional pressure cooker and select Saute function.
Add oil, onion, and bell pepper and cook until slightly softened, 3 to 5 minutes.
Turn off Saute function and add jackfruit in a single layer on top of vegetables.
Whisk tomato sauce, brown sugar, mustard, tomato paste, Worcestershire sauce,
sriracha sauce, vinegar, garlic powder, parsley, salt, and pepper together in a bowl.
Pour this mixture evenly over jackfruit in the pressure cooker.
Close and lock the lid; choose the Slow Cook option and set the timer for 4 hours.
Toast hamburger buns and serve topped with cooked jackfruit.