Heat seafood broth in a small saucepan over low heat to keep it warm.
In a large skillet, heat olive oil over medium heat and sauté sliced mushrooms until golden brown.
Add the minced shallot and garlic to the skillet, cooking until fragrant and translucent.
Stir in the Arborio rice, toasting the grains for 2 minutes until the edges are slightly translucent.
Begin adding the warm broth one ladle at a time, stirring constantly until the liquid is fully absorbed.
Continue this process for about 18 minutes until the rice is creamy and al dente.
In the final 3 minutes of cooking, stir in the langoustine tails to gently poach them in the rice.
Remove from heat and fold in the ghee, grated parmesan, lemon juice, salt, and pepper.
Garnish with fresh chopped parsley and serve immediately while hot.