In 1994, 25 years after its opening, Le Buerehiesel was awarded both a 3-star Michelin ranking and a 19/20 rating in the "Gault & Millau Guide"[4] while Westermann was named one of France's top chefs along with Joël Robuchon, Michel Bras, Guy Savoy and Alain Ducasse.

[10] In homage to his mother's cuisine, Westermann opened the vegetable-centric bistro Mon Vieil Ami (meaning "My Old Friend") in 2003.

[14] Westermann hopes to expand the market for ethically labeled meat production throughout France and the United States.

[26][27] He conducts the "Le tour de France des belles volailles" – a monthly event with an old breed in addition to the menu.

[29][30] Westermann's cooking style focuses on reinventing traditional Alsatian recipes to create signature dishes such as "Beer Brioche", "Oyster Soup", and "Pâté en Croûte."

[40] The menu at Le Coq Rico has multiple breeds of chicken, rooster, guinea fowl, and duck.