Easy Mutton dish with Mint & Coriander

Saw this in a Malayalam magazine, a Malabari recipe, haven't yet tried out, but sounds delicious - and easy.
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Ingredients
Mutton - 500 gms
Onion - 200 gms
Green Chilly - 10
Coriander leaves - 50 gms
Mint leaves - a bunch
Pepper - 10 gms
Garlic - 10 gms, ground
Ginger - 10gms, ground
Shajeera powder - 2 teaspoons
Coriander powder - 2 tablespoons
Lemon - 1
Steps
Grind - coriander and mint leaves, chilly, pepper, onion.
Add - ground ginger and garlic, shajeera powder.
Mix 2 tablespoons of the mixture with the mutton pieces, add salt, keep for 15 mins.
Then fry the mutton in a little oil, stir well for 10 - 15 mins.
Then add remaining ground mixture and stir for 10 mins.
Now cook mutton well - am guessing this has to be in a cooker, with at least 2 whistles? Wasn't mentioned specifically in the recipe.
Add lemon in the end, when it's ready to serve.