Add onion and cook, stirring frequently, until lightly browned, 3 to 4 minutes.
Add garlic and cook until fragrant, about 1 minute.
Transfer to a medium bowl.
Jacob Fox
Add 1 tablespoon oil to the pan.
Add portobellos and cook, stirring occasionally, until browned, 5 to 6 minutes.
Transfer to the bowl.
Add the remaining 1 tablespoon oil and oyster (or shiitake) mushrooms to the pan.
Cook, stirring occasionally, until browned, 5 to 6 minutes.
Return the portobellos and onion to the pan.
Stir in mustard and thyme; cook for 1 minute.
Stir in broth and sherry and simmer for 5 minutes.
Position a rack in upper third of oven; preheat broiler to high.
Scoop out most of the inside of the rolls (reserve for making breadcrumbs, if desired).
Place the rolls cut-side up on a baking sheet.
Broil until the cheese is bubbly and lightly browned, 1 to 2 minutes.
Place the top halves of the rolls on the sandwiches and serve with the sauce.
- Daily Values (DVs) are the recommended amounts of nutrients to consume each day.
(-) Information is not currently available for this nutrient.
