Harvard Square lunch-goers have a new midday dining option, newcomer Conundrum is serving lunch seven days a week from 11:30am until 2:00pm. Chefs Eric Wernsing and Jennifer Pearson are working on menu items like pumpkin bisque with cinnamon crème fraiche; and asparagus and spinach flan with frisee and wild boar lardoons as well as traditional lunch items like a California club sandwich (turkey, bacon, avocado and tomatoes) and a ½ Pound Angus burger with caramelized onions and Swiss cheese. Call Conundrum at 617.868.0335 to get the whole scoop or to ask them to save you a seat at lunch.