Tuna Tartare with Radicchio and Orange

Ingredients

• • 1 orange
  • 1/2 lb (225 g) very fresh red tuna, diced
  • 1 cup (100 g) radicchio, finely chopped (about 1/2 a radicchio)
  • 2 tsp (10 ml) mirin
  • 1 tsp (5 ml) rice vinegar
  • 1/2 tsp (2.5 ml) sambal oelek, or more to taste
  • 1 recipe nori chips