Genesis 25:29-31

Jacob had cooked [reddish-brown lentil] stew [one day], when Esau came from the field and was famished; and Esau said to Jacob, “Please, let me have a quick swallow of that red stuff there, because I am exhausted and famished.” For that reason Esau was [also] called Edom (Red). Jacob answered, “First sell me your birthright (the rights of a firstborn).”