Sos de iaurt cu castraveti murati – tartar sau remoulade dietetic

• 350 g iaurt grecesc (cu 10% grasime)
• 1 lingura ulei de masline
• sare si piper (macinat)
• 1 buc ceapa rosie mica (sau ceapa verde)
• 150 g castraveciori acri (in otet, tip cornichon)
• pătrunjel verde (tocat)
• 1 lingurita capere (in otet, optional)
• 1 lingurita tarhon verde (tocat, optional)
• 2-3 fileuri anșoa (sarate in ulei, optional)
• 2 linguri mustar de Dijon (sau mustar dulce)
• 1 lingura mărar verde (tocat)