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The ALMA interferometer, with its unprecedented combination ofhigh-sensitivity and high-angular resolution, allows for (sub-)mm wavelengthmapping of protostellar systems at Solar System scales. Astrochemistry hasbenefited from imaging interstellar complex organic molecules in these jet-disksystems. Here we report the first detection of methanol (CH3OH) and methylformate (HCOOCH3) emission towards the triple protostellar system VLA1623-2417A1+A2+B, obtained in the context of the ALMA Large Program FAUST. Compactmethanol emission is detected in lines from Eu = 45 K up to 61 K and 537 Ktowards components A1 and B, respectively. LVG analysis of the CH3OH linestowards VLA1623-2417 B indicates a size of 0.11-0.34 arcsec (14-45 au), acolumn density N(CH3OH) = 10^16-10^17 cm-2, kinetic temperature > 170 K, andvolume density > 10^8 cm-3. An LTE approach is used for VLA1623-2417 A1, giventhe limited Eu range, and yields Trot < 135 K. The methanol emission aroundboth VLA1623-2417 A1 and B shows velocity gradients along the main axis of eachdisk. Although the axial geometry of the two disks is similar, the observedvelocity gradients are reversed. The CH3OH spectra from B shows two broad (4-5km s-1) peaks, which are red- and blue-shifted by about 6-7 km s-1 from thesystemic velocity. Assuming a chemically enriched ring within the accretiondisk, close to the centrifugal barrier, its radius is calculated to be 33 au.The methanol spectra towards A1 are somewhat narrower (about 4 km s-1),implying a radius of 12-24 au.

FAUST VI. VLA 1623--2417 B: a new laboratory for astrochemistry around protostars on 50 au scale