I was watching YouTube food videos and stumbled on Filipino sisig, a sizzling dish made with crispy pork parts, as well as onion, garlic, chiles and topped with raw egg stirred in before eating. While the pork version looks delicious, I found a version using tuna and thought it would work with mackerel, the most neutral of the omega-3 fatty fish. I was right. :)

Keto Filipino Mackeral Sisg

  • ¼ cup red onion, diced (divided)
  • 2 cloves garlic, minced
  • 2 small chili peppers, chopped (*I prefer using a milder pepper like jalapeño, but also like to use one green and one red chili to add a bit more colour.)
  • 2 teaspoons tamari soy sauce
  • ½ tablespoons calimansi juice (*may sub lime juice)
  • ⅛ teaspoon celery seeds
  • 5 drops Lliquid stevia
  • ⅓ cup mayonnaise
  • 1 tablespoon avocado oil
  • 1 large can of mackerel, backbone removed and flaked (*May sub 2 small cans of tuna)
  • 1 tablespoon ghee or (unsalted butter)
  • Flaky sea salt (like Maldon or Fleur de sel and freshly ground freshly ground black pepper (to taste)
  • 2 large eggs


  1. In a medium mixing bowl, stir together garlic, half the red onion and chili peppers, soy sauce, mayo, calamansi juice (or lime juice), celery seeds and stevia. Set aside.

  2. Heat a large cast iron skillet to medium heat. Add avocado oil then add mackerel and sauté until nice and crispy. This takes a while to get this texture, up to 7-10 minutes, but it's a vital step! Remove from heat and stir together into the bowl with the mayo dressing.

  3. Add ghee (or butter) to cast iron skillet. Heat to medium heat. Once the butter has melted, add the mackerel mixture giving it a quick stir to warm it up then smooth it out to to form a consistent layer. You don’t want the mayo to get too cooked. Sprinkle remaining onion overtop then immediately crack the two eggs into the centre.

  4. Serve the sizzling skillet on the table. The eggs don’t need to be fully cooked. Stir the eggs around the hot skillet and they’ll cook as you do, then spoon the mixture over cauliflower rice and enjoy!

Did you make this keto Filipino mackerel sisig recipe? If so, please let me know how it turned out in the comments. Or if you share pics of your creations on Instagram, please tag me so I can see them. Enjoy! :)