To make your teriyaki marinade combine soy sauce, balsamic vinegar, brown sugar, salt, pepper and water. Stir or shake in a jar to combine
Spray slow cooker bowl with cooking oil and turn slow cooker heat on
Use kitchen tongs to transfer your chicken wings into the base of the bowl
Pour teriyaki marinade over chicken wings
Use kitchen tongs to rotate wings around in marinade so that both sides are covered.
Place lid on slow cooker and cook for 2 hours on high or 4 hours on low
Add 2 tablespoons of plain flour to a heatproof jug. Remove 4 tablespoons of teriyaki sauce from the slow cooker and add it to your flour. Stir continuously to mix together, trying to avoid clumping. This will create a slurry. Note 4
Use a spoon to pour the slurry back into the crockpot.
Replace the lid and cook for a further 15 mins to allow sauce to thicken