Vegetable Pakoras

Name: Vegetable Pakoras
Ingredients: 1 cup besan (Indian chickpea flour; see Cook's note); 2 tablespoons rice flour; 3/4 teaspoon kosher salt, plus more for sprinkling; 1/2 teaspoon ground turmeric; 1/4 teaspoon ajwain (carom) seeds, optional (cumin seeds can be substituted); 1/8 teaspoon baking soda; 1 tablespoon grated fresh ginger; 1/2 teaspoon lemon juice; Canola or peanut oil, for deep-frying; 1 yellow onion, cut into rings; 2 cups curly kale, ribs removed, torn into 3-inch pieces; 2 cups 1-inch cauliflower florets; Ground black lime, for sprinkling