In a large bowl, whisk together milk, vinegar or lemon juice, and 3 eggs until smooth. Let rest for 10 minutes
Whisk again and toss your vegetables in the liquid to coat, and let them sit in the mix for ~30 minutes more. (They won't be submerged so just toss to keep them soaking up moisture)
In a shallow dish, combine the cornmeal, flour, seasoning, baking powder, salt, and some cracked black pepper. Whisk to combine and smooth out any lumps
In a large dutch oven or heavy bottomed pot, add a frying oil to a depth of at least 2 inches and heat to 365°F
In batches, dredge the vegetables in the cornmeal mix to coat and deep fry until golden brown. (2-3 minutes, will depend on your vegetables, batch size, etc)
Drain each completed batch on a paper towel lined plate and hit it with a healthy sprinkling of table salt while it's still hot