Creamy White Polenta with Mushrooms and Mascarpone

Ingredients

• 0.3 teaspoon pepper black
• 1 lb the following: parmesan rind) fresh assorted
• 1 tablespoon parsley fresh chopped
• 1  garlic clove smashed
• 0.3 cup cup heavy whipping cream 
• 1.5 tablespoons juice of lemon fresh
• 0.5 cup mascarpone cheese 
• 3 tablespoons olive oil extra virgin extra-virgin
• 2 tablespoons parmesan finely grated
• 0.5 teaspoon salt 
• 1 cup grits white organic stone-ground (preferably )
• 3 tablespoons butter unsalted cold
• 0.3 cup water 

Equipment

• frying pan
• sauce pan
• whisk
• wooden spoon

Directions

1. Bring water to a simmer in a 3- to 4-quart heavy saucepan.
2. Add grits in a slow stream, whisking until incorporated. Simmer, stirring occasionally with a long-handled whisk or wooden spoon, until liquid is absorbed and polenta is thick and soft, about 30 minutes. (Grits will have a loose, risotto-like consistency.)
3. Remove from heat and stir in cream, cheese, salt, and pepper. Keep warm, covered.
4. If using porcini, halve if large, then slice lengthwise into 1/4-inch-thick slices. If using oysters, trim spongy base if necessary and slice caps into 1/2-inch-wide strips. If using chanterelles, leave small mushrooms whole, halve if medium, and quarter if large. If using lobsters, cut into 1/2-inch pieces. If using hedgehogs, trim base of stems and halve caps if large.
5. Heat oil in a 10-inch heavy skillet over moderately high heat until hot but not smoking, then sauté mushrooms, garlic, salt, and pepper, stirring occasionally, until mushrooms are golden and any liquid they give off is evaporated, 6 to 8 minutes.
6. Add water, butter, lemon juice, and parsley and heat, swirling skillet, until butter melts and liquid forms a sauce.
7. Top each serving of polenta with mushrooms and mascarpone.
8. Serve immediately (polenta stiffens as it cools), sprinkled with Parmigiano-Reggiano.
9. Mushroom sauce can be made 1 hour ahead and kept, covered, at room temperature. Reheat before using.