Heat butter in a large saucepan over medium-high. Add the 2tablespoons butter and onions stirring often until sweated, about 5 minutes. Add rice and tequila, stirring constantly, until rice is toasted, about 1minute. Reduce heat to medium.
Add 1 cup bone broth cook, stirring often, until almost absorbed,2 to 3 minutes. Continue adding broth 1/2 cup at a time, stirring until clam juice mixture is almost absorbed after each addition, until rice is al dente and mixture is creamy, 15 to 20 minutes.
Remove rice mixture from heat adding the lobster, gentlystirring it in. Add the butter, Parmesan. salt and pepper. Stir in more brothor water of you ran out of the broth, a splash at a time, to make it a tadcreamier risotto, if needed. Just before serving, stir in the chives so theystay bright green. Divide risotto evenly among 4 small bowls or plates.