Step 1 Slice off and discard the mushroom stems. Rinse and drain the mushrooms. If the mushroom caps are larger than three-quarters inch in diameter, cut them in half vertically. Put the mushrooms, wine, lemon juice, olive oil, coriander seeds and one-fourth cup water in a 3 1/2 - or 4-quart pot. Cover the pot and bring to a simmer over medium heat, gently shaking the pan a few times during the first few minutes of cooking. Simmer gently, covered, for 12 minutes to cook through.
Step 2 Using a slotted spoon, remove the mushrooms from the pot and put them into a bowl to cool. Return the mushroom liquid to a good simmer, adding any remaining liquid that the resting mushrooms have released back to the pan to reduce. Simmer until the liquid is reduced to one-fourth cup, then remove from the heat.
Step 3Pour the reduced liquid over the mushrooms and season with salt and pepper. Cool to room temperature. The recipe to this point can be made ahead and the mushrooms stored, refrigerated, for 1 to 2 days.
Step 4Heat a grill over medium heat. Grill both sides of the bread until lightly browned. Divide the mushrooms with the juices among four small bowls. Sprinkle each with fresh parsley and serve with the bread.