Roast the hazelnuts in a pan without fat until golden brown, take them out and let them cool down. Take a teaspoonful of the ricotta and shape it into 12 small balls with moistened hands.
Roll balls through the hazelnuts. Cut bacon into strips. Heat 1 tsp. oil in a frying pan. Fry the bacon in it for 3-4 minutes, turning it over, until it is brown. Season vinegar with salt, pepper and sugar, fold in 4 tbsp. oil.
Stir in the bacon. ##Radicchio## and rocket clean, wash, pluck into bite-sized pieces and drain. Fennel clean, wash, quarter and cut out hard stalk. ##Chop the fennel into fine strips.
Mix salad, fennel and vinaigrette in a bowl, season with salt, pepper and sugar, arrange on plates together with ricotta balls.