She began to think about the foreskin of Christ, where it may be located… And behold, soon she felt with the greatest sweetness on her tongue a little piece of skin like the skin of an egg, which she swallowed. After she had swallowed it, she again felt the little skin on her tongue with sweetness as before, and again she swallowed it. And this happened about a hundred times.
From “The Holy Foreskin,” Medievalists.net