Asian pork sliders

Name: Asian pork sliders
Prep time: 30 min
Cook time: 3 h
Total time: 3 h 30 min
Cuisine: Asian
Ingredients: 2kg boneless pork shoulder roast, rind removed, excess fat trimmed; 9.20 gm olive oil; 500ml (2 cups) cold water; 80ml (1/3 cup) hoisin sauce; 60ml (1/4 cup) soy sauce; 4 garlic cloves, peeled, halved; 4cm-piece fresh ginger, peeled, thickly sliced; 2 whole star anise; 2 cinnamon sticks; 12 mini extra soft lunch rolls, warmed, halved; 50g butter, at room temperature; Salt, to season; 40.00 ml white wine vinegar; 15.00 gm caster sugar; 1.20 gm salt flakes; 3 Lebanese cucumbers, peeled into ribbons; 1 Granny Smith apple, cut into matchsticks