[Answer] 5. Use Armoracia rusticana with caution! It is not a very attractive plant and the long white roots have a fiery, pungent flavour. It is much loved by the British who make a sauce from the roots to accompany their roast beef.

Step 1 : Introduction to the question "5. Use Armoracia rusticana with caution! It is not a very attractive plant and the long white roots have a fiery, pungent flavour. It is much loved by the British who make a sauce from the roots to accompany their roast beef."

...1. Horseradish 2. Sage 3. Marjoram 4. Nasturtium Wasabi is Japanese horseradish and is a common ingredient in sushi.