Peel off skins from the onion
Chop off the tip, leaving the root part intact
Cut carefully leaving ½cm at the root part so that onion will not split
Mix all purpose flour, red chili powder, garlic paste, garam masala, milk, salt well in a bowl until free flow consistency
Place onion over the flour mix and spill the flour mix over onion, such that the mix is penetrates well into all the onion's petal
Freeze it for about 30min
Heat oil in a vessel such that whole onion immerse into oil
Place the onion into oil carefully fry until golden brown
Drain oil using a kitchen towel
Sprinkle chaat masala over the fried onion blossom
Serve hot along with mayonnaise dip