place the thyme, lemon rind and garlic into a small Ziploc bag

season the crayfish tails and place them into the bag

place a straw into the bag and leave enough of it sticking out for you to suck on

seal the Ziploc bag as much as you can around the straw

suck out as much air as you can before removing the straw and sealing the bag

bring a pot half filled with water up to 70° Celsius – on a low heat setting

put the Ziploc bag into the water for 20 minutes

make sure the tails are cooked before you serve them but this should be enough time