Place beef on a small plate. Freeze until firmed up slightly, about 20 minutes. Cut chilled beef into ¼-inch slices, then into ¼-inch strips, and then cut into ¼ -inch cubes Place on a plate and refrigerate while you prep the rest of the mixins.
Dry the capers with a paper towel. In a small pan, add avocado oil and capers and fry on medium heat, moving the capers around for about 2-3 minutes or until capers are crispy. Remove to a papertowel lined place and let cool completely.
In a mixing bowl, add chopped calabrian chilies, fried capers, finely chopped shallots, worcestershire sauce, grainy dijon mustard and mix to combine.
Add beef and flaky sea salt, mix well to incorporate, taste for salt and adjust to taste. If you want it spicier, add additional calabrian chili.
Calabrian Chili Aioli
Add calabrian chili and mayonnaise into a mason jar and blend with a stick blender until smooth.
Assemble Steak Tartare
When ready to serve, chill the plate. On a plate, using a pastry brush, make a paint stroke with the Calabrian Chili Aioli.
Then add a round mold on top, spoon in the steak tartare inside, then remove the mold. Top with fresh egg yolk, sprinkle with a little additional flaky sea salt, and finely chopped chives. Serve cold with your favorite crostini or crackers.