Oyster Mushroom + Pickled Asparagus Toast

Ingredients

• 1 bundle / 1# asparagus, trimmed and cut into 2 to 4 inch stalks
• 1 shallot, thinly sliced (sliced white parts of ramps would work well here)
• 1 1/2 c water
• 1/2 c. white vinegar
• 1/4 c. apple cider vinegar
• 1 tbsp. salt
• 1 tsp. sugar
• 1 stick unsalted butter, room temperature
• 1/4 tsp. salt
• Cracked black pepper
• Greens of 3 green onions, thinly sliced (sliced green parts of ramps would work well here)
• 2 tbsp. chopped cilantro or parsley or other preferred green leafy herb
• 1/2 # of R&R oyster mushrooms, chopped into a medium dice with tougher ends of stems removed
• 1/2 tsp. salt
• 1/4 tsp. cracked black pepper
• 1/8 tsp. cayenne pepper
• 1/8 tsp. garlic powder
• 1/8 tsp. coriander
• 1 tbsp. water
• 1 tbsp. balsamic vinegar
• 4 slices of bread, toasted
• Olive oil or avocado oil for cooking oyster mushrooms