Mi hermano y yo siempre cenábamos en la casa de mi abuela.
Explanation:
This means: My brother and I used to always have dinner at my grandma's. "Cenábamos" is the imperfect of the verb "cenar" and is conjugated in the first person of the plural. The imperfect is used to talk about past habits, or past situations which don't have a precise beginning or end. In this case, it refers to a habit. The translation in English can be done using the expression "used to", which indicates the idea of habit.
Answer: Lo primero que tendría que hacer es poner el tomate en rodajas sobre el pan abierto. Despues, agregaría sal, aceite y queso. Ya está listo, lo único que queda por hacer es comerse el sándwich