A verb appearing as ᴱQ. maksa- “cook” in the Qenya Lexicon under the early root ᴱ√M(B)ASA “cook, bake” (QL/59). A nearby alternate form mark- was added and then deleted.
Neo-Quenya: The root √MBAS continued to appear in Tolkien’s later writings, so I would retain ᴺQ. maxa- “cook” for purposes of Neo-Quenya from primitive ✱mbaskā-. The verbal suffix -kā is very unusual, and maxa- might instead be derived from an ancient noun or adjective.
A verb appearing as G. brath- “cook (tr.)” in the Gnomish Lexicon of the 1910s (GL/24), marked with a “✱” indicating it was a root as well.
Neo-Sindarin: For purposes of Neo-Sindarin I retain both ᴺS. brath- “to cook” and the Neo-Root ᴺ√BRATH of the same meaning.