Real Wasabi is sometimes hard to find.
Here is another recipe from Wasabi.org using frozen peas or fresh peas.
https://wasabi.org/how-to-make-wasabi-peas/
Ingredients
2 cups fresh peas [thawed frozen ones will do at a pinch]
2 Tbsp canola oil
1/4 cup Wasabi paste made from Namida® 100% Pure Wasabi Powder (or horseradish paste)
2 tsp Namida® 100% Pure Wasabi Powder - (is it needed? maybe, but for quick down and delicious...)
1 Tbsp rice vinegar
1 tsp of corn starch
1 tsp water
1/2 tsp mustard powder
1/2 tsp garlic powder
sea salt
Method
1. Preheat the oven to 200 degrees [or use a dehydrator]. Coat a large baking sheet with canola oil.
2. Transfer the peas to the baking sheet and move them around in the oil. Season with sea salt, mustard powder and garlic powder.
3. Bake for 6 hours on the lowest oven setting you have, stirring every 30 minutes, or until the peas are dry. [You can use a dehydrator to do this job, I prefer this method as the heat isnt so fierce and it produces hotter peas.]
4. In a large bowl, mix together the wasabi paste, rice vinegar, water and corn starch. When the peas are dried out and ready, pour them into the bowl and coat them with the mixture.
5. Pour the peas back onto the baking sheet [or dehydrator] and bake for another 10 20 minutes, or until the peas are crisp and completely dry.
6. When peas are completely cool and dry, store in a sealed jar until required.