According to relevant data, Christians need to eat Eucharist (Eucharist Cake) after Sunday worship and can eat Eucharist Cake after baptism, but it does not mean that they can't eat Eucharist Cake after breakfast.
Eucharist cake is a kind of unleavened cake, made only of flour and water, without yeast, because yeast represents sin. The ancient practice was hard and dry, and it tasted bad.