Remove yam (taro) skin, wash and cut into thin strips.
Add tempura flour, rice flour and softened butter to a bowl.
Add concentrated chicken stock and sesame oil.
Add marinated prawns and mix with batter.
Add cut strips of yam and mix everything thoroughly.
Scoop out batter-coated yam strips with a prawn.
Carefully slide it into a pan of hot oil and fry for a few minutes.
Remove from the pan for a short while. Allow oil to heat up and put it back to double fry till golden brown.
Place on paper towels to drain off excess oil.
Serve immediately to enjoy a crispy snack.