Yuzu is a Japanese citrus lemon that is valued for it’s highly aromatic 
rind and Yuzu is one of the few citrus in the world that is able to 
maintain it’s tart/sourness at high cooking temperatures. Because the 
yuzu is considered a citron, the juice is very minimal, thus often 
expensive. Outside of a few Asian cuisines and particularly in Japanese 
cultural circles, yuzu is seldom grown or used because it’s rather rare.
 Used in both green and more ripe, yellow forms it’s a prized citrus in 
the culinary world.
Yuzu is sour, tart, very fragrant and slightly smaller than a billiard 
ball. The intensity and aroma of fresh yuzu is incredible. Yuzu is a 
citrus that isn’t eaten straight, but is used as a souring ingredient 
through the use of it’s juice and zest. The flavor is reminicent 
somewhere between a classic Eureka lemon and an oro blanco grapefruit, 
but still has its own unique fragrance and flavor. It is a bit more 
floral and sour and utterly wonderful. It smells so good the Japanese 
will use yuzu for perfumes and will ritualistically bath in yuzu during 
Toji (winter solstice).
There isn’t a lot of juice in each little ball of fruit, maybe a 
teaspoon per yuzu due to much of its mass being occupied by ginormous 
seeds and a thicker rind. However the juice is one of the very few 
citrus that can hold up fairly well to cooking without diminishing the 
flavor. The zest is packed with delicious oils that allow you to use 
nearly every part of the yuzu in the kitchen. Yuzu is a integral part to
 Japanese Ponzu sauce as well as yuzu-kosho, a spicy chili-salt laden 
with yuzu zest.
For the home gardener, yuzu is one of the most zone diverse citrus, 
being cold hardy down to 5-10º F. It is a bit stubborn to get to flower 
and has a few nasty thorns, but it is well worth the time & care to 
get these beautiful trees to fruit. They are still a bit hard to track 
down in the United States, but if you have a great nursery nearby, maybe
 they’ll be able to special order you one.
The fruit is ready earlier than most citrus, usually September or 
October, giving citrus heavy areas like southern California and Florida 
extra incentive to add a yuzu to their collections. One of the things we
 love most about our garden is that there is almost always something 
fruiting all year. Every season and month has something new to look 
forward to and it helps ease the grief of another favorite ending for 
the year.
For the home gardener, yuzu is one of the most zone diverse citrus, 
being cold hardy down to 5-10º F. It is a bit stubborn to get to flower 
and has a few nasty thorns, but it is well worth the time & care to 
get these beautiful trees to fruit. They are still a bit hard to track 
down in the United States, but if you have a great nursery nearby, maybe
 they’ll be able to special order you one.
The fruit is ready earlier than most citrus, usually September or 
October, giving citrus heavy areas like southern California and Florida 
extra incentive to add a yuzu to their collections. One of the things we
 love most about our garden is that there is almost always something 
fruiting all year. Every season and month has something new to look 
forward to and it helps ease the grief of another favorite ending for 
the year.
http://whiteonricecouple.com/garden/yuzu-citrus-japanese-citron-lemon/
Pronounce it: ta-ra-gon
A popular and versatile herb, tarragon has an intense flavour that's a 
unique mix of sweet aniseed and a mild vanilla. The leaves are narrow, 
tapering and slightly floppy, growing from a long, slender stem. It's a 
key herb in French cuisine (it's an essential ingredient in sauce 
Bernaise), and goes very well with eggs, cheese and poultry.
Choose the best
Go for fresh-looking leaves, with no discolouration or wilting. French 
tarragon is considered to be the best - its flavour is more subtle than 
the coarser Russian tarragon. Dried tarragon is also available. Or, for a
 ready supply, keep a pot on your windowsill, or grow in your garden or 
window box.
Prepare it
Wash, then use whole sprigs or strip the leaves from the stalks and use whole or chopped.
Store it
Fresh cut tarragon should be wrapped in damp kitchen paper, placed in a 
perforated bag and stored in the fridge. It will last for around 4-5 
days. Dried tarragon should be kept in an airtight container in a cool, 
dark place - it should last for 4-6 months.
Cook it
Use to make sauces for fish and poultry. Add to salad dressings; use to flavour butter or white wine vinegar.
Alternatives
Try fennel.
https://www.bbcgoodfood.com/glossary/tarragon