Spring Green Risotto

Name: Spring Green Risotto
Ingredients: 1-½ Tablespoon Good Olive Oil; 1-½ Tablespoon Unsalted Butter; 3 cups Chopped Leeks, White And Light Green Parts (2 Leeks); 1 cup Chopped Fennel; 1-½ cup Arborio Rice; ⅔ cups Dry White Wine; 5 cups Simmering Chicken Stock; 1 pound Thin Asparagus; 10 ounces, weight Frozen Peas; 1 Tablespoon Freshly Grated Lemon Zest (2 Lemons); 2 teaspoons Salt; 1 teaspoon Freshly Ground Pepper; 2 Tablespoons Freshly Squeezed Lemon Juice; ⅓ cups Mascarpone Cheese; ½ cups Freshly Grated Parmesan Cheese, Plus Extra For Serving; 3 Tablespoons Minced Fresh Chives, Plus Extra For Serving