I am in the process of sanding back and revarnishing my timber kitchen. Beside the induction cooktop, there is a gap either side where there was clearly previously a larger induction cooktop. I’m looking for suggestions for timber that I can cut to size and fit in the gaps that will take a walnut stain. I’m pretty sure the current benchtop is teak. Any suggestions on what timber to buy and how best to secure it would be appreciated.