Preheat oven to 350 degrees. In a heavy bottomed shallow Dutch oven (or a large skillet) set over medium heat, add the olive oil and butter. Add the onion and a pinch of Kosher salt, stirring to coat.
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Traditional Irish shepherd's pie recipe

This shepherd’s pie is simple farmhouse cooking. Ground lamb simmered with onions, carrots, leeks, and parsnips in a rich ...
This is The Easiest Recipe for Shepherd's Pie and it is perfect for those nights when you want an old fashioned comfort food dinner but don't feel like spending a lot of time standing over a hot stove ...