See Bolte u. Polívka 2: 1–18. The story is composed of three episodes.
(1) A nephew sells to his miserly uncle a means for making pots
self-cooking. (2) In revenge, he is put into a bag to be thrown into
the sea; exchanges places with a shepherd and gets his sheep, (3) then
pretends to his uncle to have got them underseas and persuades him to
try the same means of enriching himself. The first is a modification of
the self-cooking vessel, which is episode C in Bolte u. Polívka’s
analysis.
Compare Clouston, Popular Tales 2: 243, 263, for Norse (Dasent) and
Italian (Crane) parallels; Espinosa, Pedro de Ordimales cycle, JAFL 27:
169, and discussion, 220–221.
The second and third are episodes H and J in Bolte u. Polívka. See
numbers 23 and 108 in this collection.