Lemon Avocado Spaghetti With Shrimp From Pasta Modern

Name: Lemon-Avocado Spaghetti With Shrimp From 'Pasta Modern'
Ingredients: 1 large red onion, finely sliced; 1/4 cup (60 ml) dry white wine; 8 ounces (225 g) small shrimp, shelled and deveined; Olive oil; Salt; 1 pound (455 g) spaghetti or any pasta, preferably Felicetti Monograno; 1 avocado; Zest and juice of 1 lemon; Freshly ground black pepper