O-toushi/お通しis actually a bit difficult to translate.
In a Japanese (in Japan) izakaya it is an appetizer that is served with the first drink and that you pay for in general in lieu of a cover charge.
I have nothing against such a notion as it gives you a good idea of the chef’s skills!

When we can get plenty of small/mini tomatoes we just peel them (drop in hot water first and they’ll peel easily away!) and marinate them in hon dashi/Japanese soup stock (preferably konbu/seaweed) and mirin inside the refrigerator for at least a couple of hours.

Serve them with their soup and fresh parsley!
Of course, variations are infinite!
Think of the presentation, too!

RECOMMENDED RELATED WEBSITES

So Good Sushi Restaurant in Nice France
Navigating Nagoya by Paige, Shop with Intent by Debbie, BULA KANA in Fiji, Kraemer’s Culinary blog by Frank Kraemer in New York,Tokyo Food File by Robbie Swinnerton, Green Tea Club by Satoshi Nihonyanagi in Shizuoka!, Mind Some by Tina in Taiwan, Le Manger by Camille Oger (French), The Indian Tourist, Masala Herb by Helene Dsouza in Goa, India, Mummy I Can Cook! by Shu Han in London, Pie
rre.Cuisine, Francescannotwrite, My White Kitchen, Foodhoe, Chucks Eats, Things that Fizz & Stuff, Five Euro Food by Charles,Red Shallot Kitchen by Priscilla,With a Glass, Nami | Just One Cookbook, Peach Farm Studio, Clumsyfingers by Xethia, PepperBento, Hapabento, Kitchen Cow, Lunch In A Box, Susan at Arkonlite, Vegan Lunch Box; Tokyo Tom Baker, Daily Food Porn/Osaka, Only Nature Food Porn, Happy Little Bento, J-Mama’s Kitchen, Cook, Eat, Play, Repeat, Bento Lunch Blog (German), Adventures In Bento, Anna The Red’s Bento Factory, Ohayo Bento,

Must-see tasting websites:

-Sake: Ichi For The Michi by Rebekah Wilson-Lye in Tokyo, Tokyo Through The Drinking Glass, Tokyo Foodcast, Urban Sake, Sake World
-Wine: Palate To Pen, Warren Bobrow, Cellar Tours, Ancient Fire Wines Blog
-Beer: Another Pint, Please!, Beering In Good Mind: All about Craft Beer in Kansai by Nevitt Reagan!
ABRACADABREW, Magical Craftbeer from Japan
-Whisky: Nonjatta: All about whisky in Japan by Stefan Van Eycken
-Japanese Pottery to enjoy your favourite drinks: Yellin Yakimono Gallery

Non gastronomy must-see sites by Shizuoka Residents

HIGHOCTANE/HAIOKU by Nick Itoh in Shizuoka City