Add the mushrooms, bacon, spring onions and garlic and cook for 1–2 minutes. Add the lemon juice, then cover with a lid and cook over a low heat for 5 minutes, or until the mushrooms are cooked.

Place brioche slices in a single layer on a wire rack set inside ... mushroom mixture evenly over toasts; garnish with parsley, pickled onion slices, frisée, and chives. Drizzle with lemon juice ...