Green’s Dictionary of Slang

1. a tomato.

c.1889		Daily Tel. (S. J. and C.) n.p.: Now that ‘love-apples’ have become cheap, the masses may be seen continually munching them, not only because the tommies are nice, but because they are red [F&H].
1946		Mudgee Guardian (NSW) 21 Nov. 3/1: It looked as if the dry weather would flatten the tomato Derby this year, but it takes a lot to knock the ‘tommy’ enthusiast off his perch.
1966		in Newark (OH) Advocate 21 May 3/3–4: Tommy – with tomato.

2. (US) tomato soup.

1886		Marion (OH) Daily Star 22 Nov. 3/3: ‘Tommy in the bowl’ means one bowl of tomato soup.
1910		S.F. Call 9 Jan. 6/5: There was ‘Tommy in the bo-owl! Tommy!’ You’d hear a waiter bellow that if [...] he was ordering tomato soup.