Choose hardwood boards such as maple, walnut, or oak
Mill the boards flat, straight, and square
Cut the boards to the desired lengths
Arrange the boards in the preferred grain pattern
Apply wood glue to the mating edges
Clamp the boards tightly together
Let the glue cure fully
Scrape or sand the surface flat
Trim the block to final dimensions
Round over or ease the edges
Sand through progressively finer grits
Clean off all dust
Apply food-safe mineral oil or butcher block conditioner
Let the finish soak in and wipe off excess
Repeat oiling as needed