Risotto in a Lemon Cup

10 cups beef broth or 10 cups chicken broth or 10 cups vegetable broth 10 tablespoons butter 3 cups carnaroli rice 2 lemon peel , of grated 6 tablespoons[...]

150 g unsalted butter 200 g onions , chopped 450 g arborio rice 900 ml chicken stock or 900 ml vegetable stock, boiling hot 1 garlic clove , finely chopped 1[...]