A childhood belief about church

When I was very small the Catholic Church used the old LAtin liturgy, and the priest celebrated mass with his back to the congregation. During the consecration, a lot happened. The priest washed his hands, poured some water into a chalice, then he would make the sign of the cross over the chalice, which seemed a sort of stirring motion when seen from behind. A few moments later he opened the tabernacle, and took out a chalice full of already consecrated hosts. Naturally, I thought the tabernacle was a small oven, and the priest had stirred up a batch of communion wafers and baked them on the spot.