Crispy Mushroom Toast

Name: Crispy Mushroom Toast
Ingredients: 1 oz. dried shiitake or other dried mushrooms; 1 cup fresh ricotta; Kosher salt, freshly ground black pepper; 1 garlic clove, finely grated; ¼ cup finely chopped tender herbs (such as parsley, chives, and/or mint); Pinch of crushed red pepper flakes; 4 Tbsp. (or more) extra-virgin olive oil, divided, plus more for drizzling; 1 tsp. plus 1 Tbsp. sherry vinegar or red wine vinegar; 4 thick slices country-style bread; 10 oz. mixed fresh mushrooms, torn into bite-size pieces; 1 Tbsp. soy sauce