Renkon no ebi hasami-age, lotus root with shiso

So, I've taken a liking to renkon, lotus root. I bought fresh one this spring and used it all for chips, but I picked up a pack of frozen renkon as well. It's been sitting in my freezer waiting for inspiration... Then I got 2 renkon recipes from my Japanese friend Ryoko (thanks!), and yesterday I tried out one of them in a moderated form.
The recipe calls for a shrimp mixture to be put inside the renkon "sandwiches", but I decided to do it as a vegetarian side dish as I had no shrimps.
Update: I made it again with shrimps! Also good, and I took new pictures for this post.

Here's the recipe (including shrimps):

Deep-Fried Lotus Root and Shrimp Sandwiches

4 lotus roots (or frozen pieces to double to the number of shiso leaves)
6 - 8 shiso leaves
1/2 sheet nori, cut into strips

7 oz/200g shrimps
4 inch naga-negi onion (or spring onion)
1/2 knob ginger
1 tbsp katakuriko starch (or potato/corn starch)
1/4 tsp salt
1 tsp sake
1/2 lemon

hakurikiko flour (normal flour)
oil for deep frying

Eat with ponzu, soy sauce with ginger, sansho salt or lime juice.

How to make it:
Shrimp filling:
De-vein the shrimps, and rinse them in cold water. Chop the onion and ginger finely. Place it in a food processor with the katakuriko starch, salt and sake. Run it until it becomes a fine mixture.

Cut the lotus root into 1/8 inch pieces, if too big, into half moons again. Soak them in water with vinegar for 4-5 minutes.

Dust the lotus root with flour and put a shiso leaf on one piece. Add shrimp mixture, if using, put another lotus root on top. Seal with a nori band. Sprinkle with more flour.

Deep fry in hot oil until crisp, but not brown. Turn once.
Garnish with lemon. Serve with dressing of choice.