Slow Cooker Beef Stew

Yukon gold potatoes ((454g) cut into 1 1/2-inch pieces)

carrots ((280g) 1-inch pieces)

celery ((120g) 1/2-inch pieces)

red onions ((114g) 1-inch dice)

sprigs thyme

beef chuck ((795g) chuck eye roll or chuck tender roast)

kosher salt

black pepper

olive oil ((30ml))

balsamic vinegar ((60ml))

minced garlic ((10g))

unsalted beef stock ((720ml))

soy sauce ((30ml))

cornstarch ((33g))

water ((60ml))

chopped parsley