Egg & salt water
Many families have a hard-boiled egg in salt water at the beginning of the Seder meal.
No-one is certain of the reason, though there are separate explanations for the Seder plate having salt water (it recalls the salty tears of the Hebrews in Egypt) and the egg (it symbolises the springtime offering). Some people say that the combination reflects Jewish history.
Jews are accustomed to suffering for their faith (hence the salt water “tears”) but they get more and more determined to live and thrive (like an egg which gets harder and harder the more you boil it).