One of the mysteries of the English language finally explained.
Eggs baked in the oven, or poached, fried, etc., on the hob, in a covered dish, and served in the dish in which they are cooked; (also more generally) a plate of fried eggs.
Late 19th century. From French oeufs sur le plat, plural of oeuf sur le plat from oeuf egg + sur on + le the + plat.
oeufs sur le plat/ˌəːf səː lə ˈplɑː/
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