Potato gratin is, of course, the traditional side dish with roast beef, and this version is just right for a special occasion. Adding flavor are typical steak house ingredients, like mushrooms, garlic and herbs. Place a baking sheet in the oven on the rack below the gratin to catch any liquids that may bubble over.
Recipe information
Yield
Serves 12
Ingredients
Preparation
Step 1
Melt butter in large pot over high heat. Add all mushrooms and sauté until liquid evaporates, about 10 minutes. Add garlic, thyme and rosemary; sauté 1 minute. Add chicken broth and simmer until liquid evaporates, stirring often, about 18 minutes. Season with salt and pepper. Cool.
Step 2
Position 1 rack in middle of oven and another rack in bottom third of oven; preheat to 375°F. Butter 13 x 9 x 2-inch glass baking dish. Arrange 1/3 of potatoes in dish, overlapping slightly. Top with half of mushroom mixture. Sprinkle 1/3 of cheese over. Repeat layering 1/3 of potatoes, remaining mushroom mixture and 1/3 of cheese. Arrange remaining potatoes atop cheese. Whisk half and half, cream, salt and pepper in large bowl to blend; pour over potatoes. Cover loosely with foil.
Step 3
Place baking sheet on bottom rack in oven. Place baking dish on middle rack in oven and bake until potatoes are tender and liquid thickens, about 1 hour 15 minutes. Uncover. Using metal spatula, press on potatoes to submerge. Sprinkle remaining cheese over potatoes; bake until cheese melts and gratin is golden at edges, about 15 minutes longer. Let stand 10 minutes.
