Peel the apples, core them and cut into 1/4 inch dice. Set aside.
In a large bowl combine the kefir, one egg, sugar. In another bowl mix the flour, salt and baking soda. Add the wet ingredients to the dry and stir to combine. Stir in the diced apples and let it sit undisturbed for 20 minutes.
Add the oil to a non-stick frying pan to cover the bottom up to 1/4 inch/1 cm deep and heat it over medium heat. Test if the oil is ready by sprinkling a tiny amount of flour. If it sizzles, the oil is hot enough for frying.
Stir the batter to ensure an even distribution of the apples throughout. Scoop a small amount with either a spoon or an ice cream scoop and drop a fritter no larger than 2 inches in diameter into the hot oil. Let it cook until golden brown then flip and cook on the other side. The fritters will puff up as soon as they are flipped. Each batch takes 4.5-5 minutes to cook on medium heat. Continue until the batter is gone. You may need to add more oil throughout the process.
In a small bowl combine the icing sugar and lemon juice, stir with a spoon until you have a smooth glaze. Drizzle the glaze with a teaspoon all over the apple fritters before serving.