Cheesy Polenta with Portobello and Spinach Ragout

Name: Cheesy Polenta with Portobello and Spinach Ragout
Ingredients: FOR POLENTA:; 4 cups Water; 1 Tablespoon Butter; 1 pinch Salt; 2 cups Extra Fine Polenta; ¼ cups Heavy Cream; 2 cloves Garlic, Grated; ⅓ cups Cheddar Cheese, Shredded; ¼ cubes Finely Crumbled Feta; _____; FOR RAGOUT:; 3 whole Portobello Caps, Sliced; 1 whole Red Onion Finely Sliced; 2 cloves Garlic; 2 Tablespoons Extra Virgin Olive Oil; 2 cups Fresh Baby Spinach; ¼ cups Crumbled Feta; 1 teaspoon Salt; 1 teaspoon Black Pepper