Prepare the pasta first (allow about 15 minutes). Bring plenty of water to a boil in a big pot. Add a pinch of salt, a dash of oil and the pasta. Cook al dente; drain; set aside. Meanwhile, cut onion into 1 cm slices, quarter the slices and separate the rings. (Pieces should be about the size of a pasta twist.) Gently drain and rinse the beans. Mince the tarragon. Prepare accompaniments. Prepare the sauce (about 15 minutes total) Heat 1 tablespoon of oil and the garlic in a wok or skillet. Saute the onion over medium to medium-high until onion is softer and sweeter; about 3 to 5 minutes. Over medium heat, gently add the drained beans to the onion; season with salt, pepper, tarragon (as much or as little as you like) and heat for 2 to 3 minutes. Stir in the pasta. Heat for 3 to 5 minutes. Remove from heat. Add the bottled vinaigrette made with balsamic and toss. Serve immediately. July 3rd served crumbled gorgonzola as pasta garnish (good) and seedless red grapes. (Just a pinch of dried tarragon, jar recently opened.) Canned beans are fragile. Work quickly and gently. Avoid over-heating. Recipe By : Vegetarian Pasta Cookbook (Sarah Maxwell, Editor)