“Coffee and love are best when they are hot” is a saying that has been printed on many images. “Coffee and love taste best when hot” has also been printed on many images.
 
“Kaffee und Liebe sind heiss am besten” (the German version) has also been printed on many images. This saying was printed in the Deutsches Sprichwörter-Lexikon (1870) by Karl Friedrich Wilhelm Wander.
 
“Coffee and love are best when they are hot. German Proverb” was posted on the newsgroup alt.quotations on April 15, 2022. “Coffee and love are best when they are hot. (German)” was printed in the book The Routledge Book of World Proverbs (2006) by Jon R. Stone.
 
“But as always there’s an Ethiopian proverb to make even the smallest events important, ‘Coffee and love taste best when hot’” was printed in The Record (Hackensack, NJ) on November 8, 2000.  “Coffee and love taste best when hot.  ~Ethiopian Proverb” was posted on X/Twitter by African Proverbs on December 10, 2018.
   
     
Google Books
Deutsches Sprichwörter-Lexikon:
ein Hausschatz für das deutsche Volk
By Karl Friedrich Wilhelm Wander
Leipzig, Germany: F. A. Brockhaus
1870
Pg. 1089:
Kaffee und Liebe sind heiss am besten.
 
Newspapers.com
8 November 2000, The Record (Hackensack, NJ), “Brewing up a ritual” by Larry Litt, pg. F-4, col. 2:
But as always there’s an Ethiopian proverb to make even the smallest events important, “Coffee and love taste best when hot.”
 
Google Groups: alt.quotations
Coffee
Grace McGarvie
Apr 15, 2002, 12:42:30 PM
(...)
Coffee and love are best when they are hot. German Proverb
   
Google Books 
The Routledge Book of World Proverbs
By Jon R. Stone
New York, NY: Routledge
2006
Pg. 268:
Coffee and love are best when they are hot. (German)
   
Google Books
Peculiar Proverbs:
Weird Words of Wisdom from Around the World
By Stephen Arnott
New York, NY: St. Martin’s Press
2007
Pg. 123:
Coffee and love are best when they are hot.
GERMAN
 
X/Twitter
Leslie Kitahara
@kohikan
Coffee and love taste best when hot.
7:10 AM · Apr 30, 2009
   
X/Twitter
Clachan Coffee House
@clachancoffee
Coffee and love taste best when hot. (Ethiopian proverb) http://fb.me/4Spy9kr
6:40 AM · Jan 27, 2010
 
X/Twitter   
The War Of Quotes ™
@WarOfQuotes
Coffee and love are best when they are hot. ~ German Proverb #WarOfQuotes
1:20 PM · Sep 26, 2011
 
X/Twitter
Reaction Facts
@reactionfacts
Coffee and love are best when they are hot. - German Proverb
11:56 PM · Dec 28, 2012
 
X/Twitter
DeeDee
@DDJumare
Hmmmn..She is high on coffee!”
@mareeyama: “Coffee and love taste best when hot.” ~ Ethiopian proverb”
2:38 AM · Dec 29, 2012

X/Twitter
Nikki
@nikkipardini
“coffee and love are best when they are hot” 😌☕️❤️
11:45 AM · Oct 23, 2013
     
X/Twitter
African Proverbs
@AfricanProverbs
Coffee and love taste best when hot.  ~Ethiopian Proverb
1:33 PM · Dec 10, 2018
 
X/Twitter
Lina
@Lina197701
Coffee and love are best when they are hot.” –
Good Morning everyone 🌤💐💛
11:23 PM · Dec 22, 2023
 
X/Twitter
Jacqueline
@Jacqueline__LK
Coffee and love taste best when hot.
6:35 AM · Dec 27, 2023