There was a deleted noun G. thlibri “soup” in the Gnomish Lexicon of the 1910s (GL/73) based on the early root ᴱ√SḶPḶ (QL/84).

Neo-Sindarin: This early root became ᴹ√SALAP “lick up” in The Etymologies of the 1930s (Ety/SÁLAP), but I assume the existence of a variant form ᴹ√SULUP “lap up” serving as the basis for words like 1948 ᴹQ. sulpa- “to lap up” (PE22/114). As such, I would update the Gnomish word to ᴺS. solph “soup” as a cognate to [ᴱQ.] sulpa “soup” (QL/84).