Tarbais Beans and Black Périgord Truffle in a Mason Jar with Sunchoke Espuma

Here I combine the cheapest of ingredients, dried beans, with the most expensive, foie gras and truffle (though you may forgo the foie gras, if you wish). These white runner beans from Tarbais are best known for being used to make cassoulet. This style of bean is available at Ranch Gordo. Large white kidney beans can be substituted. I serve this in a small mason jar at the table, rather than an elegant serving dish. It grounds you, this casual service piece, encourages you to relax and enjo