In almost every Bengali Family one or two days are reserved for Vegetarian meals. In those days We usually eat total Vegetarian Dishes without Onion & Garlic. As in Bengali Cuisine Onion, Garlic & Masoor Dal is considered as Non-Vegetarian. In those Vegetarian Meals Mung or Mug Dal takes an important part of the Meal. Bhaja mooger dal is a Bengali delicacy. The split moong dal is roasted in ghee/oil till it turns deep golden (not brown) and gives a nutty aroma. Sometimes it is dry roasted as well. It is then cooked and tempered with spices which only enhance the flavor.It makes the plain dal even better in taste and flavor. Usually thinly sliced Potato or Bringle fries are served with this Dal.
Mackerel is a very tasty sea fish with very strong flavor and very similar to Bengali "Hilsha" fish. This fish is very healthy and full of Omega-3 fatty acid. This fish cooks in its own oil. You do not need lots of oil to cook this fish. It releases lots of oil when you add the fish into the pan. Here is another similar recipe with Hilsha fish I have tried with Mackerel fish. Here it is.