Fresh hand-battered mushrooms fried crispy golden and served with mustard horseradish dipping sauce.
Clean the mushrooms and remove the stems. Pat them dry with a paper towel.
In a large bowl, combine the flour, cornstarch, baking powder, salt, and black pepper. Gradually whisk in the cold sparkling water until the batter is smooth.
In a deep skillet or pot, heat the vegetable oil over medium-high heat until it reaches 350°F (175°C).
Dip each mushroom into the batter, ensuring it's fully coated, then carefully place it in the hot oil. Fry in batches until golden brown, about 3-4 minutes. Remove and drain on paper towels.
In a small bowl, mix the prepared horseradish and Dijon mustard together until well combined.
Serve the crispy fried mushrooms hot with the horseradish mustard dipping sauce.