Wales' Grand Slam stars made a victorious Millennium Stadium return as the Ospreys booked their second successive EDF Energy Cup final against Leicester.
Ospreys paraded nine of the Wales side that won the RBS 6 Nations in Cardiff last weekend.
But they had to work just as hard before subduing Saracens in a dress rehearsal for next month's Heineken Cup quarter-final.
Wing wizard Shane Williams put the Ospreys on their way with a touchdown just before half-time.
Williams and company, though, were unable to impose their glittering running game on dogged, well-organised opponents, and they could not breathe easily until centre Gavin Henson stormed over after 50 minutes.
Replacement back-row forward Filo Tiatia added a third touchdown that finally buckled Saracens' resistance, then Williams claimed his second try in typically audacious fashion. Williams, recently-crowned Six Nations player of the tournament, has now scored eight tries in his last five games.
Fly-half James Hook added two penalties and two conversions, booking a Twickenham appointment with the Tigers on April 12 and an opportunity to avenge last season's 41-35 defeat.
Saracens had their moments, yet they lacked Ospreys' firepower behind the scrum and could not release attacking strike weapon Brent Russell in dangerous areas.
Glen Jackson notched Sarries' points with an angled penalty.
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JONATHAN PEARCE
ALEC STEWART
THE MOLE