Gyoza de ternera - Meat lovers Gyoza

INGREDIENTS TO MAKE 28 "GYOZA".
28 PIECES DUMPLING WRAPPERS
FILLING:
300 G MINCED BEEF
50 G NAPA CABBAGE
30 G. GREEN ONION
1 TABLESPOON GARLIC CLOVE GRATED
1 TABLESPOON GRATED GINGER
1.5 TABLESPOON JAPANESE SOY SAUCE
1 TABLESPOON RICE WINE "SAKE"
1/2 TABLESPOON SESAME OIL
½ TABLESPOON CORNSTARCH
1 TEASPOON SUGAR
1/4 TEASPOON SALT
BLACK PEPPER
TO COOK:
3/4 CUP OF WATER
1/2 - 2 TABLESPOON CORNSTARCH (OPCIONAL)
VEGETABLE OIL ( FOR PAN FRIED)
SESAME OIL ( FOR AROMA)
SAUCE:
2 TABLESPOONS LIGHT SOY SAUCE
1 TABLESPOON JAPANESE RICE VINEGAR
LA-YU CHILI OIL (OPTIONAL)