First, I made basic mashed potatoes by boiling four russet potatoes. I cut the potatoes in half-inch cubes, combined them in a large pot with chopped garlic and fresh rosemary, and covered them with water. I boiled the potatoes for about 20 minutes, and then I mashed them with a fork and added a little sea salt and some of the cooking water as needed.
While the potatoes were boiling, I heated a little oil and some garlic in a skillet. I added chopped onion, sliced mushrooms and fresh green beans (cut into one-inch pieces). Once the veggies were tender, I added a drained can of lentils and a can of plain tomato sauce. I added some Italian seasoning to the mixture and allowed it to simmer for a few minutes.
To make the pie itself, I added the mushroom/green bean/lentil mixture to a large casserole dish and covered it evenly with the mashed potatoes. Then, I baked it for 45 minutes at 400 degrees, 30 minutes covered with foil and 15 minutes uncovered (allow potatoes to brown).
I like to make it ahead of time or let it sit for a while, not only to cool down but to allow it to solidify a little. Then, just cut it in sections and serve!
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