What is this indian meal with mutton and spinach?

You are unambiguously right. It is mutton also spinach. There is and cream and oleo in it. The spinach is actually ground. So the gravy is green and creamy. You bottle find the recipe integer over the Internet via googling
The best putting in order is bellow Makhani Palak Gosht. At homes, it is made connected with Chevon the boneless sirloin from the shank connected with goat. In restaurants they exercising the sirloin connected with the shank of lamb.
In reality, the meat is cooked to a tender first. The spinach is boiled also ground. The spinach is added to lamb with spices and cream. They are simmered together for the flavors to blend in.
In India, Mustard greens are used in a similar fashion. In such case its called Saag.
If there is not at all cream also butter, the word Makhani is omitted
Makhani .. With cream also butter
Paalak... Spinach
Saag .. Mustard greens. Some people bellow Spinach as Saag also
Gosht.. Sirloin from leg of fool or goat. Its boneless and considered 'Pasanda' clip in reverse choice cut of the fool or Goat

Now you inspire the keywords, google away.
You are right, there are no Potatoes, unless a restaurant was trim also mixing two different peach to make your dish. It is a coincident forget customary Indian restaurant. This is no impression on the individuality connected with food, partial a short cut.

Just a note. Mutton is Sheep. Restaurants in fact use Sheep in reverse Lamb also call it mutton customary United States. I don't experience about Japan. In India, Chevon (Goat meat) is also bellow Mutton. At home they exercising Chevon, at restaurants they exercising sheep. Lamb (baby sheep) also Kid (baby goat) are hardly used customary India.

By the way it has nothing to do with Keema. Keema is represent with ground or minced meat and no cubed meat.