Etymology
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sauce (n.)

mid-14c., "condiment for meat, fish, etc.; pickling liquid, brine," from Old French sauce, sausse, from Latin salsa "things salted, salt food," noun use of fem. singular or neuter plural of adjective salsus "salted," from past participle of Old Latin sallere "to salt," from sal (genitive salis) "salt" (from PIE root *sal- "salt").

From late 14c. as "a curative preparation, medicinal salt." Often in 15c.-17. sawce, salse; constant reimportation of the word in French cookery terms might have helped keep the older spelling. Also formerly applied broadly in provincial English and U.S. to condiments of any kind, especially garden vegetables or roots eaten with meat (1620s), also known as garden-sauce.

Figurative meaning "something which adds piquancy to words or actions" is recorded from c. 1500; the sense of "impertinence" is by 1835, but the connection of ideas in it is much older (see saucy, and compare sass). Slang meaning "liquor" is attested by 1940. Figurative phrases suggesting "subject to the same kind of usage" is by 1520s (serued with the same sauce).

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sauce (v.)

mid-15c., "to season (food), add a sauce or relish to," from sauce (n.). By 1510s in the figurative sense of "intermix or accompany with what gives piquancy or relish." From 1862 as "to speak to impertinently, treat with impertinence." Related: Sauced; saucing.

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apple-sauce (n.)

also applesauce, by 1739, American English, from apple + sauce (n.). The slang meaning "nonsense" is attested from 1921 and was noted as a vogue word early 1920s. Mencken credits it to cartoonist T.A. ("Tad") Dorgan. DAS suggests the word was thus used because applesauce was cheap fare served in boardinghouses.

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saucepan (n.)

also sauce-pan, 1680s, "small metallic cooking vessel with a long handle," from sauce (n.) + pan (n.). Originally a pan for cooking sauces, now in more general use.

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salsa (n.)

1846 as a kind of sauce served with meat; 1975 as a kind of dance music; separate borrowings from Spanish, literally "sauce," from Vulgar Latin *salsa "condiment" (see sauce (n.)). In American Spanish it is especially used of a kind of relish with chopped-up ingredients; the music is a "blend" of Latin jazz and rock styles.

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sass (n.)

"impudence, insolence," by 1835, a back-formation from sassy, and ultimately a colloquial pronunciation of sauce. Sass (n.) as a colloquial variant of sauce (n.) is attested by 1775. The verb sass, "to talk or reply saucily, speak impertinently to" is by 1856. Related: Sassed; sassing.

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saucy (adj.)

c. 1500, "resembling sauce" (a sense now obsolete), later, of persons, words, etc., "impertinent in speech or conduct, flippantly bold, cheeky" (1520s), from sauce (n.) + -y (2). The connecting notion is sauce in the figurative sense of "that which adds intensity, piquancy in words or actions."

Compare Skelton's have eaten sauce for "be abusive." Also compare sauce malapert "impertinence" (1520s), and sauce (n.) in its obsolete use as a vocative for "impudent person" (1530s).  In Shakespeare, with overtones of "wanton, lascivious," it was "a term of serious condemnation" [OED]. Also compare salty in similar senses.

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saucer (n.)

mid-14c., "small, shallow dish," from Anglo-Latin saucerium and Old French saussier (Modern French saucière) "sauce dish," from Late Latin salsarium, neuter of salsarius "of or for salted things," from Latin salsus (see sauce (n.)).

Originally a small dish or pan in which sauce is set on a table. Meaning "small, round, shallow vessel for supporting a cup and retaining any liquid which might spill" is attested from c. 1700.

Figurative of large, round eyes (as of a ghost or a person frightened by one) from 14c. (13c. in Anglo-French) and thus originally a reference to the condiment dish. Short for flying saucer by 1947; hence saucerman, saucerian, etc.

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*sal- 
Proto-Indo-European root meaning "salt."

It forms all or part of: hali-; halide; halieutic; halite; halo-; halogen; sal; salad; salami; salary; saline; salmagundi; salsa; salsify; salt; salt-cellar; saltpeter; sauce; sausage; silt; souse.

It is the hypothetical source of/evidence for its existence is provided by: Greek hals "salt, sea;" Latin sal, Old Church Slavonic soli, Old Irish salann, Welsh halen, Old English sealt, German Salz "salt."
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hollandaise 
1841, from French sauce hollandaise "Dutch sauce," from fem. of hollandais "Dutch," from Hollande "Holland" (see Holland).
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