Ponzu is a kind of sauce that has a base of soy sauce and some kind of citrus juice, to which other flavorings are added, which is then allowed to sit and mature. It is probably my favorite sauce in all of Japanese cuisine; it is strong and sour and a perfect match for food simmered at the table, mushrooms, fish paste cakes, bonito, crab, etc. You can buy pretty good brands at the store, but just like anything, if you make your own the flavor will be much deeper and complex. It is easy to make and stores forever in the fridge, so even newbies to Japanese food can try this out if they have access to an Asian food market. My basic recipe is from Tsuji's Japanese Cooking: A Simple Art.
Ingredients:
1 cup lemon juice or other sharp citrus juice such as a mix of lemon and lime juice or sudachi juice. (Fresh-squeezed is miles better than the preserved store crap.)
1/3 cup plus 2 T rice vinegar
1 cup dark soy sauce
2 T tamari sauce
3 T mirin, alcohol simmered off (this step reduces bitterness in the sauce)
1/3 or 10 grams (a handful) of dried bonito flakes (hana-katsuo)
2-inch (5-cm) square of konbu, wiped
Mix all ingredients and let stand 24 hours. Strain through cheesecloth and mature 3 months in a cool dark place, or refrigerate. Keeps indefinitely, but should be used within 1 year for best flavor.
材料:
レモン汁:1カップ (すだちとかでもいい)
酢:1/3 カップ+ 大さじ1
醤油:1カップ
たまり:大さじ2
煮きりみりん:大さじ3
花鰹:10g
昆布:5センチ角
材料を混ぜて、24時間置く。漉して、3ヶ月すずしい、暗い場所におく(冷蔵庫でもいい)。持ちが長いですけど、どんどん味がすべるから、1年以内に終わった方がいい。