Clean and gut the bass, remove the gills, fill the cavity with the fennel seeds and wild fennel.
For the marinade, plunge the tomatoes in boiling water for 10 seconds, remove the skin. Dice the flesh. Finely chop the spring onion, chop the chives, pick the redcurrants off the bunch. Combine all the marinade ingredients with the soy sauce and olive oil.
Cook the bass for 15 minut