This looks like what in french we call a "citron cedrat" (citron is lemon in french, cedrat is citron... that's funny/confusing...). They have a very thick rind, and you can make marmelade out of the rind and it's delicious (I made a few like 3 or 4 years ago and they were very good, it can be a bit bitter but if you soak the rind in cold water before it's less bitter).
Citron is an original, ancestral species, Citrus medica. Lemon (Citrus limon) is a natural hybrid between a Citron and a Bitter orange (Citrus x aurantium, which is a natural hybird between the Pomelo, Citrus maxima, and the Mandarin orange, Citrus reticulata). A Meyer lemon (Citrus x meyeri) is a natural hybrid of the lemon and Mandarin orange
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u/ArtofWASD 1d ago
Sir... that is a Citron. Not a lemon.