Line a large bowl with cheesecloth, a thin cotton dishcloth, or a thin t-shirt.
Grate 4 medium russet potatoes and 1 medium onion using the large, coarse holes on a box grater, food processor, or hand grater. Add the vegetables and 2 teaspoons Diamond Crystal Kosher Salt into the bowl.Note: A hand grater will not get as many “stringy” ends that you might typically see in popular latke recipes — for those, you’ll likely need a food processor.
Grab the ends of the cheesecloth together and squeeze as much liquid as possible out of the cheesecloth. The potatoes and onions release a lot of liquid, so don’t worry if this takes a few minutes.
Once the potatoes and onions are as dry as possible, transfer the potato/onion mixture directly into the bowl and set aside the cheesecloth (you will use it again in a few minutes).
Add ¼ teaspoon baking soda, ⅓ cup matzo meal, a generous amount of freshly ground black pepper, and 2 eggs to the bowl and mix until just combined. If you find that the batter is not holding together, you can add the final egg.
Prep the oil for frying: In a large cast-iron or heavy bottomed skillet, add about ¼-inch of oil and set to medium-high heat. The oil is ready when sizzling, but not smoking (between 350℉ - 360℉). Note: You want enough oil so that at least half of your latke is submerged to ensure even cooking.
While the oil is heating, place the latke batter back into the cheesecloth and gently squeeze out any excess liquid once more. Note: This time, you don't need to worry about aggressively removing out any liquid, just 1 - 2 squeezes should be good!
To form a latke, scoop ¼ cup of batter into your hands and loosely form into a patty (don’t pack it down or it will get dense), about 3 - 4 inches in diameter and ¼ to ⅛ inches thick, depending on your desired thickness and width.
Note: I highly recommend trying a small test latke to see how it comes out. Once you've tasted a tester, see if you need to adjust the salt, thickness, or heat before frying the rest.Fry the rest of the latkes: Carefully place a latke into the oil using a spatula (be careful, since the oil is hot!). I typically cook 3 - 4 latkes at a time in the oil. You can also spoon a bit of batter directly into the pan to make it easier.
Cook until golden brown on one side, about 2 - 3 minutes, then flip with a metal spatula until the other side is golden brown. Typically, this takes about 4 - 6 minutes total.
Once the latke is cooked, transfer to a wire rack lined with paper towels (or a plate lined with paper towels). Gently press the latke to let any oil drain from the sides. Sprinkle with flaky salt, and allow to cool for 2 - 3 minutes.
While the next batch is cooking, you can keep the latkes warm in the oven (especially on a wire rack on top of a baking sheet if you have one) at 250℉. However, they'll be crispiest eaten straight from the fryer.
For serving:
Top the latkes with a bit of fresh parsley or dill if desired, and serve immediately with applesauce and sour cream.
For the homemade applesauce (optional):
To a large dutch oven or heavy-bottomed pot, add all ingredients.
Cover and bring to a boil, then uncover and reduce the heat to a simmer. Simmer for 20 - 25 minutes until the apples mash easily with a fork or spoon. This may take a bit longer, depending on the kind of apples you have.
To finish the applesauce:For a chunky mash, you can mash the apples directly in the pot with a fork or potato masher until you’ve reached the desired consistency. Transfer to a serving bowl and let cool before serving. At this point, you can also season the applesauce again with more cinnamon or salt if desired. If you want more sweetness, I recommend adding some maple syrup. For a smooth mash, transfer the apple mixture to a blender. Blend until smooth. At this point, you can also season the applesauce again with more cinnamon or salt if desired. If you want more sweetness, I recommend adding some maple syrup.
Notes
Squeezing as much liquid out as possible is one of the biggest contributing factors to a good latke. This is why a thinner cloth, like cheesecloth, is better because it’s easier to squeeze out that liquid.
Do not let your latke batter sit out — prep the ingredients and make the batter right before frying. Otherwise, the potatoes can oxidize too much and turn brown. If you’re worried about oxidation, you can add toss them in cold water with a squeeze of lemon juice. But either way, you’re going to want to make your latkes as quickly as possible from when you start grating the potatoes and onion.
Storage Instructions: Latkes are best eaten fresh out of the fryer, but they can be kept warm stored on a wire rack set over a baking sheet in the oven at 250°F.
You can also store leftover latkes in an airtight container in the fridge for 3 - 5 days and reheat them in a 350°F/177°C oven for 10 minutes until warmed through.