Hi all, Some people usually put the mirepoix under the meat while roasting but when i read a "professional cooking" cookbook (page 311), they said: "these mirepoix acuatlly harmful because the moisture of the vegetable creates steam around the roast" but according to my thinking, i think the moisture of mirepoix will keep the meat away from drying so why they said it harmful ? or am i wrong ? And one more question, in page 311 of this cookbook too, they said: "Fat protect the roast from drying, while moisture washes away protective fat and allow drying" . Do they mean the moisture keep the meat drying ? I am not so good at english,