One secret and the meat will melt in your mouth like butter!

One secret and the meat will melt in your mouth like butter!
Ingredients:
eggs: 4 pc
soy sauce: 25 ml (0.8 fl oz)
corn starch: 40 g (1.4 oz)
beef: 1 kg (2 lb)
olive oil: 30 ml (1 fl oz)
soft butter: 100 g (3.5 oz)
onion: 3 pc
garlic: 10 g (0.4 oz)
salt: 6 g (0.2 oz)
black pepper: 4 g (0.1 oz)
sweet paprika: 4 g (0.1 oz)
mustard: 25 g (0.9 oz)
soy sauce: 20 ml (0.7 fl oz)
water: 250 ml (8.5 fl oz)
corn starch: 40 g (1.4 oz)
water: 50 ml (1.7 fl oz)
scallions: 30 g (1.1 oz)
parsley: 25 g (0.9 oz)
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