In a large mixing bowl, combine the Brussels sprouts, leeks, eggs, flour, lemon zest and juice, and salt. Stir until the flour is fully incorporated.: The moment you fold these ingredients together you will notice the texture shift, the shredded Brussels sprouts becoming evenly coated and glossy from the eggs and lemon juice . Smell the fresh citrus and mild onion like aroma from the leek , which signals the mixture is well balanced. A common mistake is overmixing until the sprouts lose their structure, which makes the batter paste like and heavy, so stop once everything is evenly moistened. If the mixture seems too watery, let it sit for a few minutes so the flour can absorb moisture, or squeeze out a touch of excess liquid with a towel. This step matters because uniform coating ensures even browning and helps the latkes hold together while frying.
Heat a thin layer of coconut oil in a large skillet over high heat. Prep a plate or baking sheet with paper towels.: You will hear the oil whisper at first and then begin to shimmer, a visual cue that it is ready for frying. Using high heat gives a fast sear which creates that coveted crisp exterior without overcooking the interior. A frequent error is using too little oil or too low a temperature, which leads to greasy, limp latkes rather than crackly ones. Keep the oil depth shallow, just enough to crisp the edges, and have paper towels ready to absorb excess oil as you transfer each batch. Proper temperature control is essential to prevent the latkes from absorbing too much oil and to achieve an even golden color.
Arrange a layer of Brussels sprout latkes in the hot oil, 1-tablespoon of batter per. Gently flatten the scoops with a flat metal spatula. (You just want to make sure the top is flat for when you flip.) Cook until browned and very crispy on the first side, about 1 to 2 minutes. Carefully flip and repeat on the second side, adding more oil as necessary. Remove to the paper towels to drain. Continue cooking the latkes in batches until the batter is all gone.: When the batter hits the pan you should hear an immediate, soft sizzle, and the edges will begin to brown within seconds. Pressing gently with a spatula creates a uniform surface so the latke cooks evenly, and you will see steam escaping as moisture releases. Avoid overflattening to the point they become paper thin, which causes rapid burning, or underflattening which can prevent a proper flip. The right amount of pressure gives a compact disk that browns consistently, creating a satisfying crunch when ready.
Meanwhile, make combine the ingredients for the aioli in a small food processor and puree until smooth. Transfer to a serving bowl.: Watch for a deep golden hue along the exposed edges and a fragrant, toasty aroma from the pan. The sound will shift from high pitched sizzle to a lower, steady crackle as moisture reduces. Flipping too early risks tearing the latke, while waiting too long can cause sticking or burning, so look for that golden edge and slight release from the skillet. Proper timing here ensures a crunchy exterior and a tender inside that is still moist rather than dry.
Season the latkes with salt and a squeeze of lemon. Serve alongside the anchovy aioli, tahini yogurt, or your sauce of choice.: The flip will reveal whether you achieved an even sear, and you want the second side to mirror the first in color and texture. When you add oil, do so sparingly and let it reheat to shimmering before adding more latkes, otherwise the temperature drop will make the next batch soggy. A common mistake is crowding the pan which reduces the oil temperature and prevents crisping, so cook in batches if needed. The second side usually needs slightly less time, and watching the aroma and color will tell you when to remove them.
Remove to the paper towels to drain. Continue cooking the latkes in batches until the batter is all gone.: Transferring to paper towels mops up excess oil and helps the latkes remain crisp rather than softening on the plate. They will give off a faint steam as they rest, and a brief pause on a cooling rack set over towels can preserve the texture better than stacking. Resist piling them too closely which traps steam and softens the crust. This step helps maintain the ideal texture so each bite stays crunchy until served.
Meanwhile, make combine the ingredients for the aioli in a small food processor and puree until smooth. Transfer to a serving bowl.: When you puree the anchovy fillets with mayonnaise and lemon juice , you will smell a heady, savory note that mellows into a silky sauce. The blending creates a smooth emulsion and releases the anchovy umami, which gives the aioli depth without tasting fishy. A common pitfall is underprocessing which leaves small anchovy fibers; keep blending until fully smooth. The finished aioli should be creamy and glossy, ready to cut through the richness of the fried latkes.
Season the latkes with salt and a squeeze of lemon. Serve alongside the anchovy aioli, tahini yogurt, or your sauce of choice.: The final squeeze of lemon and sprinkle of sea salt brightens and sharpens the flavor, and you will notice the citrus bringing out the savory and vegetal notes. Serving them hot ensures that the contrast between the crisp exterior and silky aioli is most pronounced. Avoid seasoning too far in advance which can draw moisture out and soften the crust; finish just before serving for the best texture. This finishing touch is what transforms them from good to memorable.