Combine flour, salt, bicarbonate of soda, flat beer/ ice-cold water and oil. Whisk until smooth and chill for 1 hour before use.
Heat the butter; add finely chopped mushroom stalks, onion, garlic, chillies, lemon rind, coriander, and breadcrumbs.
Cook for 3-5 minutes. Stuff the mushroom cavities with the filling. Dust with seasoned flour and set aside.
Dip the mushroom in the batter and fry in hot oil until crisp and golden in color.
Season with salt and serve hot. Season with salt and pepper.
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Key Ingredients: Mushroom, butter, onion, garlic, green chillies, lemon, coriander leaves, breadcrumbs, salt, flour, baking soda, vegetable oil