In a large pan, melt 2 tablespoons of butter along with 1 tablespoon of olive oil over medium heat. Sauté 1 minced shallot and 4 small cloves of garlic until softened.
Add 2 cups of Arborio rice to the pan, toasting it for a couple of minutes until it becomes slightly translucent around the edges.
Pour in 1/2 cup of white wine, stirring continuously until it's mostly absorbed by the rice. Season with 1 teaspoon of salt and 1 teaspoon of pepper
In a separate pot, keep the lobster stock (4 cups) and water (1 1/2 cups) mixture warm over low heat. Begin adding this mixture to the rice one ladle at a time (about 1/2 cup per ladle), stirring frequently. Allow the liquid to be mostly absorbed before adding the next ladle.
Continue this slow-cooking process until the rice is al dente and has a creamy consistency. This should take about 18-20 minutes.
Stir in 4 ounces of mascarpone until well combined.
Add the reserved lobster meat. Stir gently to combine.
Add the chopped chives and mix.
Next, add 1/4 cup of grated Parmigiano Reggiano and 1teaspoon of lemon zest and fold until combined.
Once everything is well combined, serve the lobster risotto hot, garnishing with additional lobster chunks and a sprinkle of chives.