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Jonah learned the craft of mosaic-making in the 1960s, when he carried out a series of commissions for Catholic churches. The process involved drawing out the design back to front on thick paper, onto which the glass tiles or tesserae were glued into place in sections. Then each section was pasted over with white tile cement and stuck in place on the wall. When all was totally dry, Jonah soaked the paper with water and peeled it off. The final stage was to grout in between the individual tesserae over each section, then wipe off the tiles while leaving the grout in between each one.
Apart from his mosaics in churches, Jonah also made such pieces for civic sites. His most notable mosaics were commissioned for churches in Newport and Morfa Nefyn (now at a school in Rhyl) and for Castle Hill, Tenby.