وَعَلَى التَّمْرَةِ مِثْلُهَا زُبْدًا
Translation: And upon the date there is an equal amount of butter.
وَ: conjunction.
عَلَى التَّمْرَةِ: prepositional phrase linked to a fronted predicate.
مِثْلُ: postponed nominative subject, muḍāf; هَا: pronoun as muḍāf ilayh.
زُبْدًا: accusative tamyīz explaining what substance is equal in measure.
The pronoun refers to the date; zubdan clarifies the substance involved in the equality of quantity.