Fish and Citrus Tostadas

Ingredients

• Fish

  • 1 1/2 lb (675 g) cod fillets without skin
  • 2 oranges, juiced
  • 2 tbsp (30 ml) vegetable oil
  • 1 lime, zest finely grated

• Tostadas

  • 1 small red onion, thinly sliced
  • 1 lime, juiced
  • Sour cream, to taste
  • Tomatillo Salsa Verde, to taste
  • 8 corn tostadas (see note)
  • 2 oranges, peeled down to the flesh, flesh cut into pieces
  • 1/4 small red cabbage, thinly sliced on a mandoline
  • 4 radishes, sliced into thin rounds on a mandoline
  • Cilantro leaves, finely chopped, to taste
  • Lime wedges