Soft pretzels are often served with mustard.
       
“Pretzels are only vehicles for mustard. I live in the fastlane” was posted on Twitter by Ticia Drake Isom on July 12, 2009. “Pretzels are just a vehicle for mustard” was posted on Twitter by (((Jackie))) on August 5, 2011. “Pretzels are just a vehicle for mustard” was posted on Twitter by Julie Hammerle 2.1 on March 10, 2012. “the pretzel is but a vehicle for the mustard.-a relatively old proverb” was posted on Twitter by lydia ekeroth on February 18, 2014.
     
       
Wikipedia: Pretzel
A pretzel, from dialectal German pronunciation, standard German: Breze(l) and French / Alsatian: Bretzel) is a type of baked pastry made from dough that is commonly shaped into a knot. The traditional pretzel shape is a distinctive symmetrical form, with the ends of a long strip of dough intertwined and then twisted back onto itself in a particular way (a pretzel loop or pretzel bow)
(...)
Pennsylvania
In particular, the S-shaped soft pretzel, often served with brown mustard, became very popular in Philadelphia and was established as a part of Philadelphia’s cuisine for snacking at school, work, or home, and considered by most to be a quick meal.
 
Twitter
Ticia Drake Isom
@ticia42
Pretzels are only vehicles for mustard. I live in the fastlane.
7:29 PM · Jul 12, 2009·Twitter Web Client
   
Twitter
QQ Capitol Hill
@QQCapitolHill
RT @bneck Hot Pretzel Happy Hour kicks off at 4. A perfect vehicle for the transportation of sweet or spicy mustard! Just $2 until 6
3:47 PM · Jan 21, 2011·Hootsuite
 
Twitter
(((Jackie)))
@Jaculyn
Replying to @SpikeEskin
@SpikeEskin Pretzels are just a vehicle for mustard.
1:19 PM · Aug 5, 2011·Echofon
     
Twitter
OUTLIER
@Outlier
We’re playing the “vehicle for #guldens mustard” game. So far: pretzels, cheeze nips, almonds, potato chips.#officesnacks
5:16 PM · Oct 11, 2011·Twitter Web Client
   
Twitter
Julie Hammerle 2.1
@JulieHammerle
Pretzels are just a vehicle for mustard.
6:32 PM · Mar 10, 2012· HTC Peep
   
Twitter
Clay
@ClayBass4D
These pretzels are just a vehicle for spicy mustard
5:38 PM · Jan 4, 2013·Twitter for Mac
   
Twitter
Elaine
@etdragon
Replying to @EarlessShrimp
@EarlessShrimp oh man you need to try it. Pretzels are the perfect vehicle for mustard.
7:48 PM · Nov 11, 2013·Twitter for Android
     
Twitter
lydia ekeroth
@lydiaekeroth
the pretzel is but a vehicle for the mustard.
-a relatively old proverb
11:49 PM · Feb 18, 2014 from Escondido, CA·Twitter for iPhone
 
Twitter
Nate Beatty
@tnbeatty
Pretzels are merely a vehicle for spicy mustard.
11:13 PM · Feb 20, 2015·Twitter for Mac
   
Twitter
𝙿𝚊𝚒𝚐𝚎 𝚆𝚎𝚊𝚟𝚎𝚛
@MoxieMarmalade
Pretzels are just a vehicle for spicy mustard.
11:25 PM · May 18, 2015·Twitter for iPhone
     
Twitter
Margaret Wallace
@MargaretWallace
Hailing from #Philadelphia, this is a day I can get behind!
Pretzels = convenient vehicles for gobs of mustard. yum.
#NationalPretzelDay
1:02 PM · Apr 26, 2016·Twitter Web Client
 
Twitter
john
@johnstheworst
Pretzels are a vehicle for mustard welcome to my TED talk
12:20 PM · Sep 24, 2018·Twitter Web Client
   
Twitter
jer hammer
@HammerJer
Replying to @DanRather
Pretzels are the vehicle for eating yellow mustard! 
2:39 AM · Jan 25, 2019·Twitter for iPhone
     
Twitter
Joseph Ong Ⓥ
@vegetaful_joe
Pretzels are just vehicles for mustard.
12:13 AM · Apr 17, 2019·Twitter for Android
 
Twitter
Jason Wheeler
@jasonwheelerBC
Replying to @Micro_Mama
home made pretzels are a vehicle for mustard
6:12 PM · Feb 7, 2021·Twitter for iPhone
 
Twitter
Amy Sligh
@AJamyjones
what are pretzels if not a vehicle for mustard
6:09 PM · Mar 23, 2021·Twitter Web App
 
Twitter
Deborah
@CommonGroundSD
Replying to @CapehartJ
Silly Jonathan! A pretzel is simply the vehicle for the mustard. #moremustardplease
7:36 PM · Apr 27, 2021·Twitter for Android