Porcini-potato Cake With Green Salad

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Details

14 Ingredients

• 1 cup dried porcini mushrooms (1 oz)
• 2 cups boiling water
• 3 Tbsps unsalted butter
• 2 medium shallots, very finely chopped
• Kosher salt and freshly ground black pepper
• 1 1/2 cups coarsely shredded Gruyère cheese (6 ozs)
• 4 lbs yukon gold potatoes, peeled and coarsely shredded
• 1 medium onion, finely chopped
• 1/2 cup extra-virgin olive oil
• 2 Tbsps fresh lemon juice
• 1 Tbsp walnut oil
• 6 ozs mixed baby greens, such as mesclun and arugula (12 cups)
• 1 cup grape tomatoes, halved
• Truffle salt (optional)