THE SARDINE TARTINE
makes 1 tartine · total 15m · tested

Sardines present a completely different structural and chemical
challenge than tuna. If you flake sardines into a mayonnaise binder, you
create a greasy, oxidized paste with a metallic finish. The classic,
high-end application for sardines is the Tartine—an open-faced
architectural build that keeps the fish intact while contrasting the
rich, soft fillets with aggressive acidity and extreme crunch.

INGREDIENTS
  -- The Acidic Relish --
       25 g   Vidalia onion (finely brunoised)
       15 g   apple cider vinegar (cuts through heavy fish oils)
        5 g   fresh parsley (minced)
        2 g   sugar (bridges the harshness of the ACV)
        1 g   black pepper (coarse)
  -- The Structural Canvas & Barrier --
              bread (thick; 1 very thick slice of unsliced daily loaf)
       15 g   mayonnaise
       10 g   dijon mustard
  -- The Protein --
      120 g   sardines (drained; 1 standard tin (approx. 85g-120g). Keep
              fillets whole.)
              coarse salt (for finishing)

STEPS
  Prep & Assemble
    1. Macerate the Relish: Toss the 25g of brunoised Vidalia onion with
       the 15g of ACV, the 5g of parsley, the sugar, and the black
       pepper. Let this steep for 10 minutes to create an aggressive,
       acidic topping. Note: Acetic acid denatures the raw onion and
       cuts through the heavy fish lipids.
    2. Establish the Maillard Base: Toast the thick slice of bread
       heavily. You want a deep, aggressive crust. Note: Because the
       sardines are soft, the bread must provide maximum auditory crunch
       and structural resistance.
    3. Apply the Hydrophobic Seal: Whisk the 15g of mayonnaise and 10g
       of Dijon together to form a sharp Dijonnaise. Spread this edge-
       to-edge on the toasted bread. Note: This sharp fat barrier
       prevents the fish oils and the relish from turning the bread
       soggy.
    4. Mount the Protein: Carefully lift the sardine fillets from the
       tin and lay them whole across the Dijonnaise barrier. Do not mash
       or press them into the bread. Note: Flaking oily fish accelerates
       oxidation.
    5. The Acidic Cap: Using a fork, lift the onion and parsley relish
       out of the vinegar and drape it directly over the sardines.
       Finish with a light dusting of coarse salt directly on the fish
       to pop the final flavor. Note: Acid must hit the palate before
       the fat.

EQUIPMENT
  Toaster or hot skillet.

FOOD SAFETY
  Keep canned sardines stored in a cool, dry place prior to opening.

STORAGE
  Must be assembled and eaten immediately to preserve the structural
  integrity of the toasted bread.

LICENSE
  CC BY 4.0: share and adapt freely, credit longproof and link to
  https://longproof.duckdns.org/recipes/the-sardine-tartine.txt
  https://creativecommons.org/licenses/by/4.0/