Barley Stew Recipe with Caramelized Onions, White Beans & Spinach

INGREDIENTS

2 tsp

olive oil

medium yellow onions, cut in half & thinly sliced

1/4 cup

water

1 tbsp

balsamic vinegar

garlic cloves, minced

3/4 tsp

dried thyme

1/2 tsp

kosher salt

1/2 tsp

ground pepper

1 14.5 ounce can

diced tomatoes, including juices

1 cup

pearl barley

4 cups

vegetable broth, plus more for thinning

1 14.5 ounce can

cannellini beans

3 cups

(packed) fresh spinach leaves

Salt and pepper,