What was served in Jesus' last supper?

You get somewhat of a clue when Jesus gives the disciples communion. They had wine and unleavened bread (without yeast).

As this was a Passover Seder meal observance, the following would have been served, as a minimum:

Matzah - unleavened bread.

Wine

Maror and Chazeret - two sorts of various bitter herbs....possibilities include lettuce, endive, pepper grass,or watercress.

Karpas - a vegetable dipped in salt water and vinegar.

Z'roar - roasted lamb shank.