Sticky gifts aside, May plans to use her first audience with the new US president to call for a reinvigorated ‘special relationship’ between the two countries.
May is due to arrive in the US on Thursday ahead of the meeting on Friday.
Spokesmen have indicated she will tell Trump the two of them are well positioned to work together.
At a Republican gathering on Thursday night, May will say: “The leadership provided by our two countries through the special relationship has done more than win wars and overcome adversity. It made the modern world.
“The institutions upon which that world relies were so often conceived or inspired by our two nations working together.
“It is through our actions over many years, working together to defeat evil or to open up the world that we have been able to fulfill the promise of those who first spoke of the special nature of the relationship between us. The promise of freedom, liberty and the rights of man.”
May says she “won’t be afraid” to speak candidly and has indicated that she does not expect to agree on everything.
The jam will come as part of a gift hamper handed to Trump’s wife Melania. Alongside preserves it will contain a range of treats like apple juice, marmalade and “cranberry and white chocolate shorties.”
Trump himself will be presented with an old-fashioned Scottish drinking vessel known as a Quaich. Downing Street told the Guardian it would be engraved to serve as “a timeless reminder of the enduring Scottish values of friendship and hospitality.”