This is an irregular verb with a spelling change. It follows the conjugation pattern of the verbs abrazar and volar.
Stem Change: o ue (almuerzo)
Spelling Change: ze ce - zé cé
PresentPresente
Nosotros almorzamos en casa los domingos.
We have lunch at home on Sundays.
PreteritePretérito indefinido
Ayer almorcé con mis compañeros de trabajo.
Yesterday I had lunch with my coworkers.
ImperfectPretérito imperfecto
En la escuela almorzábamos a las doce.
At school we used to have lunch at twelve.