Seafood€€Vieux-LilleTue-Thu 12:00-14:00 and 19:00-21:30; Fri-Sat 12:00-14:30 and 19:00-22:00; Sun 12:00-14:00; closed Monday
Les Fishtons on Rue des Bouchers in Lille fries Boulonnais fish for a small room of fish and chips, plus a crispy fish burger with Flemish compote.
Why locals love it: A small room on Rue des Bouchers frying Boulonnais fish, which most visitors walk past on their way to the bigger terraces.
Tip: The fish burger uses cornflakes for the crust and Flemish apple compote instead of tartare.
Japanese€Lille-CentreMon-Fri 11:30-15:00; Sat 11:30-18:00; closed Sunday
Salon UBU on Rue Pierre Mauroy in Lille makes onigiri and onigirazu to order, a lunchtime-only counter that most visitors walk straight past.
Why locals love it: A lunchtime onigiri counter on Rue Pierre Mauroy, closed by mid-afternoon most days and almost never spotted by visitors.
Tip: Saturday is the only day it stays open past 15:00, and it closes entirely on Sunday.
Bistro€Vauban-EsquermesTue-Thu 17:00-00:00; Fri 17:00-01:00; Sat 17:00-02:00; Sun 17:00-23:00
La Pépite on Place Sébastopol in Lille is a bar canteen of five euro bowls, the cornflake-crusted fried chicken among them, open late at weekends.
Why locals love it: Five euro bowls that change every week, voted the best bar for a snack by the readers of a Lille city guide.
Tip: Every bowl costs five euros and the list changes weekly, so ask what is on rather than reading an old menu.
Sandwich€Vieux-LilleMon-Wed 12:00-00:00; Thu-Sat 12:00-01:00; closed Sunday
Costaud on Place du Vieux Marché aux Chevaux in Lille builds sandwiches to order by day and turns to shared plates at night, across three floors.
Why locals love it: Three floors of a 19th-century building on a small square off the main Vieux-Lille circuit, sandwiches by day and shared plates at night.
Tip: The square it sits on is one street off the tourist route, which is why it stays a local room.
Vietnamese€Vieux-LilleMon-Fri 12:00-14:00 and 19:00-21:00; Sat 12:00-14:30 and 19:00-21:30; Sun 19:00-21:00
Smokey Banh Mi on Avenue du Peuple Belge in Lille smokes its own meat and buys its bread from the Degruson bakery up the road in Vieux-Lille.
Why locals love it: Meat smoked on the premises and bread bought from the Degruson bakery up the road, which is why an 11.50 euro sandwich has a following.
Tip: Ask what has been in the smoker that day. The pork is the constant, the rest rotates.
Bistro€Vieux-LilleMon-Fri 12:00-14:30; Sat 12:00-15:00; closed Sunday
Bernard et Léon on Rue de la Clef in Lille is a bowl canteen named for the founders' two grandfathers, open at lunch only and priced under 16 euros.
Why locals love it: A lunch-only canteen on Rue de la Clef whose bowls are named after the founders' own grandfathers, Bernard and Leon.
Tip: Lunch only, and it shuts at 14:30 on weekdays. Saturday runs half an hour later.