Ingredients
Crab filling
Method
1.Cut 8 x 8mm-thick rounds from each kūmara (you need 24 rounds in total); discard tapered ends. Brush rounds with 2 tablespoons of the olive oil; season. Cook rounds, in batches, on a heated chargrill plate (or barbecue) for 6 minutes each side or until cooked through. Remove from heat; cover to keep warm.
2.Make crab filling: combine ingredients in a small bowl; season.
3.Coat prawns in remaining olive oil; season. Cook prawns on heated chargrill plate for 1 minute each side or until just cooked through. Remove from heat; cover to keep warm.
4.Place watercress, sorrel and coriander leaves in a small bowl with extra virgin olive oil and juice. Season; toss to combine. Mash avocado in a small bowl.
5.Place 12 kūmara rounds on a board; top each with crab filling, a prawn, mashed avocado and watercress salad. Top with the remaining kūmara rounds.