March 14 is Pi Day, when math nerds everywhere trade their calculators for forks and celebrate the tastiest way possible with actual pie. I’ve decided to mark the occasion by calculating the ...

Next, add the sliced onion, carrots ... Reheat: Reheat the green lentil shepherd’s pie in the oven for about 20-30 minutes or until heated. Cover the dish so it retains moisture.

Place the pan into the oven and bake for 30 minutes until golden and crisp. Leave the pie to cool slightly, then slide onto a board and slice into wedges to serve.