Abstract: Process for the pre-isomerization of hops, in particular for preparing a beer or like beverage obtained from solely malt or from malt and at least one substitution cereal in a preparation line comprising an operation for obtaining a sugared wort and an operation for fermenting said wort in the presence of yeasts. The pre-isomerization is effected by cooking and extrusion of the hops at a temperature lower than 120.degree. C. by a continuous passage of the hops, which are previously dried and pressed in a cooker-extruder having at least two screws, with a quantity of water less than 50% by weight, the extruded hops being then mixed with the sugared wort in the beverage-preparing line.