Warm caramelised French onion slow cooker dip

Name: Warm caramelised French onion slow cooker dip
Prep time: 15 min
Cook time: 1 h
Total time: 1 h 15 min
Cuisine: Mediterranean, French, European
Ingredients: 40g butter, chopped; 3 large brown onions, halved, thinly sliced; 40.00 gm water; 2 shortcut bacon rashers, finely chopped; 20.00 ml malt vinegar; 8.00 gm brown sugar; 300g tub sour cream; 250g spreadable cream cheese; 1 tsp garlic powder; 6.10 gm Worcestershire sauce; 61.88 gm light whole-egg mayonnaise; 20.00 ml finely chopped fresh chives; Assorted vegetables, to serve; Crackers, to serve