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1
Cut the chicken into 4 cm (11/2 inch) squarish pieces.
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2
Combine the shoyu, mirin, sake and garlic in a non-metallic bowl.
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3
Working over the bowl, squeeze the grated ginger in your hand, or in a small piece of muslin (cheesecloth), to extract the juice into the other ingredients - discard the fibrous remains.
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4
Add the chicken pieces and toss to coat.
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5
Cover and refrigerate for 30 minutes - no longer as the flavour will become too strong.
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6
Combine all the sauce ingredients except the sesame seeds in a saucepan with 1 tablespoon water.
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7
Stir over high heat until the sugar has dissolved, then bring to the boil and cook for about 5 minutes, or until slightly syrupy.
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8
Remove from the heat, discard the ginger and set aside.
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9
When ready to serve, one-third fill a deep-fryer or large heavy-based saucepan with oil and heat to 180C (350F), or until a cube of bread dropped into the oil browns in 15 seconds.
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10
Tip the chicken pieces into a colander to drain off the marinade, then place them in a large bowl.
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11
Add the starch and burdock and mix well.
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12
The mixture should be a little sticky, but not too wet - if it is, add a little extra starch.
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13
Cook the chicken in batches for 6-7 minutes, or until the coating is golden and crisp and the chicken is cooked through.
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14
Drain well on kitchen paper and keep warm in a low oven while you cook the rest of the chicken.
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15
While the last batch of chicken is deep-frying, bring the sauce just to the boil again, then remove from the heat.
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16
Place all the chicken in a large clean bowl and drizzle in half the sauce while tossing the chicken.
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17
Repeat with the remaining sauce, tossing well to ensure a light, even coating.
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18
Sprinkle with sesame seeds, if using, toss again, then serve immediately.