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We report on a systematic search for oxygen-bearing Complex Organic Molecules(COMs) in the Solar-like protostellar shock region L1157-B1, as part of theIRAM Large Program "Astrochemical Surveys At IRAM" (ASAI). Several COMs areunambiguously detected, some for the first time, such as ketene H$_2$CCO,dimethyl ether (CH$_3$OCH$_3$) and glycolaldehyde (HCOCH$_2$OH), and othersfirmly confirmed, such as formic acid (HCOOH) and ethanol (C$_2$H$_5$OH).Thanks to the high sensitivity of the observations and full coverage of the 1,2 and 3mm wavelength bands, we detected numerous (10--125) lines from each ofthe detected species. Based on a simple rotational diagram analysis, we derivethe excitation conditions and the column densities of the detected COMs.Combining our new results with those previously obtained towards otherprotostellar objects, we found a good correlation between ethanol, methanol andglycolaldehyde. We discuss the implications of these results on the possibleformation routes of ethanol and glycolaldehyde.

L1157-B1, a factory of complex organic molecules in a Solar-type star forming region