When oil is heated, sauté shallots and add in spices.
Fry till aromatic and oil splits.
Add mutton, potatoes, tomato and red chilies.
Stir all the ingredients together for a couple of mins.
Pour in 1/2 liter of water.
Cook till mutton and potatoes are softened.
Add vinegar and soya sauce, if needed salt.
Stir to combine in and remove from heat.
Note: if you like more gravy, add more water.