Why are there flames coming up from the altar?

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Last night I was invited to Italian restaurant - imagine my surprise when I found out that it's in an old church! I'm not sure what the story is, but someone the church organization moved out, and the restaurant moved in. The kitchen is up where the altar was, including a wood-burning oven for the pizza... It really was a beautiful Gothic church with the stained glass windows and everything. Oh, well... See below for a picture.

The food actually was really good (especially the tiramisu), and the place was packed by the time we left.

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