These Plant-Based Mushroom French Dip Sandwiches Have 365 Calories

INGREDIENTS

2 tsp

unsalted butter

2 1/2 tbsp

olive oil, divided

large yellow onions, vertically sliced

1/4 tsp

kosher salt

1 1/4 lb

portobello mushroom caps, gills removed, sliced into strips

3/4 cup

lower-sodium vegetable broth

1/3 cup

dry sherry

1 tbsp

vegetarian or vegan Worcestershire sauce

2 tsp

chopped fresh thyme

1 tsp

lower-sodium soy sauce

1/4 tsp

freshly ground black pepper

2 tbsp

Dijon mustard

1/2 tsp

prepared horseradish

whole-wheat hoagie rolls, split

very thin Swiss cheese slices (such as Sargento Ultra Thin)