Portobello 'Steaks' with Bearnaise Sauce

== Ingredients ==
* ¼ cup dry white wine
* 2 tbsp white wine vinegar
* ¼ cup finely chopped shallots (2 small)
* 1 tbsp chopped fresh tarragon or 1 tsp dried
* ½ tsp whole black peppercorns, crushed
* 1 large egg
* 1 tbsp cornstarch
* ⅔ cup buttermilk
* 1 tbsp butter
* 1 tsp Dijon mustard
* ¼ tsp salt
* 3 tbsp balsamic vinegar
* 3 tbsp extra-virgin olive oil
* ½ tsp salt
* ¼ tsp freshly ground pepper
* 12 medium portobello mushroom caps (1½ lbs total)
* 8 cups watercress (about 4 bunches), large stems trimmed
* 1 cup cherry tomatoes, halved
* ½ cup slivered red onion
== Directions ==
# Make sauce: in small saucepan, combine wine, vinegar, shallots, tarragon and peppercorns and bring to a simmer over medium heat.
# Cook until most of the liquid has evaporated, 2 to 4 minutes.
# Remove from heat and set aside.
# In medium bowl, whisk together egg and cornstarch, then gradually whisk in buttermilk until mixture is smooth.
# Add to shallot mixture and return saucepan to medium heat.
# Cook, whisking constantly, until mixture simmers and thickens slightly, about 2 minutes.
# Whisk in butter, mustard and salt.
# To keep sauce warm, place saucepan in larger pan of barely simmering water.
# Preheat broiler.
# In small bowl, whisk together vinegar, oil, salt and pepper.
# Using small spoon, scrape away black gills inside mushroom caps.
# Brush half the balsamic mixture over both sides of caps.
# Place mushrooms, cavity-side down, on baking sheet or broiler pan and broil until tender and browned, 4 to 5 minutes per side.
# Meanwhile, in large bowl, combine watercress, tomatoes and onion.
# Add remaining balsamic mixture and toss to coat.
# Divide salad among plates and top each with 3 portobello "steaks," cavity-side up.
# Spoon dollop of bearnaise sauce onto each and serve at once.
Category:Vegetarian Recipes
Category:Portobello mushroom Recipes
Category:White vinegar Recipes
Category:Balsamic vinegar Recipes
Category:Cherry tomato Recipes
Category:White wine Recipes
Category:Buttermilk Recipes
Category:Red onion Recipes
Category:Shallot Recipes
Category:Watercress Recipes