Pearl barley: 50g (1/4 cup, dry), Mushrooms (cremini or button): 100g (1 cup, sliced), Onion: 50g (1/2 small, diced), Garlic: 3g (1 clove, minced), Vegetable broth (low-sodium): 240ml (1 cup), White wine (dry): 30ml (2 tbsp, optional), Parmesan cheese: 15g (1 tbsp, grated), Fresh thyme: 2g (1/2 tsp, chopped), Olive oil: 5ml (1 tsp), Butter: 5g (1 tsp), Baby spinach: 30g (1 cup), Salt: 1g (1/4 tsp), Black pepper: 1g (1/4 tsp)