Related for Bava Metzia 178:5
מלח ודאי כענבים ודבר אחר דמי
— Come and hear: He [the labourer] may not parch [the crops] at the fire and eat, nor warm them in the earth,<span class="x" onmousemove="('comment',' By placing them in warm soil. ');"><sup>5</sup></span>
Tosefta Maasrot
Workers that were hoeing among the fig trees or picking dates or harvesting olives -- they may eat and are exempt, since the Torah gave them permission (see Deut. 23:25-26). [But] they may not dip [the figs or olives] in salt and eat unless the homeowner gave them permission, and they may not eat them with bread unless the the homeowner gave them permission.
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