Methods and apparatus for producing a particulate proteinaceous product are disclosed. Raw animal matter comminuted. Hydrolysing enzymes are added to preheated food-grade oil and added to the ground matter. The resulting suspension is preheated to hydrolysis temperature. Controlled hydrolysis of proteins in the suspension achieves a predetermined partial hydrolysis of the proteins to form a hydrolysate/oil suspension. At the desired level of hydrolysis the enzymes are heat-inactivated. Non-digestible solids are removed from the suspension and the suspension is pasteurized and partially dehydrated to concentrate the hydrolysate. Some of the oil is removed to form the product. The method and apparatus exhibit substantial resistance to equipment clogging.