In large pot, heat oil to 350 degrees F.

If using hearts of palm, remove center from hearts of palm and slice into 1/2-in. thick rings.

If using mushrooms, clean mushrooms, remove top and slice into 1/4-in. thick rounds. Cut a hole in middle of mushroom rounds (don’t throw away the center pieces, you can fry these).

In mixing bowl, soak mushrooms in oat milk while oil heats up.

In another mixing bowl, whisk together flour, potato starch and seasonings. Coat calamari with flour mixture and remove any excess before frying in preheated oil.

Fry in small batches for 4 minutes flipping halfway through. Repeat until remaining calamari are done.

Serve warm with squeeze of lemon juice, freshly minced parsley and side of marinara sauce or garlic aioli for dipping.