Clap your own hands together.
Clap both of your hands against your partner’s hands.
Clap your own hands together.
Clap your partner’s right hand with your right hand.
Clap your own hands together.
Clap your partner’s left hand with your left hand.
You could also make the pattern more interesting and/or difficult by slapping your thighs, snapping your fingers, etc. The possibilities are endless!