Heat an oven to 170℃/340℉ and place a large roasting pan with 2 kg beef short ribs (arranged in a single layer) on the middle shelf. Roast for 50-60 minutes till the ribs are browned then remove from the oven and set aside.
In a small saucepan on medium heat, add 240 ml soy sauce, 2 cloves garlic, 1 inch ginger, ½ teaspoon red chilli flakes50 g brown sugar, ½ teaspoon salt and 2 tablespoons tomato puree and bring to a boil. Reduce to simmer for 5 minutes then turn off heat.
Pour the teriyaki sauce over the ribs ensuring they are thoroughly coated then place back in the oven to glaze for a further 10 minutes.
Notes
The ribs can be roasted ahead then glazed and roasted for a further 10 minutes before serving.Store leftovers in a sealed container and keep in the fridge for 3 days or freeze for a month. Reheat in a saucepan or in the oven. The fat will have solidified when chilled but will melt again when warmed up, you may need to add a tiny amount of water.