De forskellige ingredienser i den præjudicielle opskrift er godt beskrevet i Den Europæiske Unions kogebog, men teorien støder sammen med de forskellige sammenfaldende omstændigheder, hver gang man forsøger at tilberede en ret, idet den anvendte varmekilde, kasserollerne og madvarernes tilstand og herkomst varierer. Selv sindstilstanden hos den, der kaster sig ud i tilberedningen af retten, kan variere.
The various ingredients which go into the recipe for a preliminary ruling are clearly enough set out in the European Union cookbook, but theory comes up against the varying circumstances which apply each time the dish is prepared, as the chosen heat source, the pans, the condition and origin of the ingredients and even the state of mind of whoever is cooking are always different.EurLex-2 EurLex-2