Groninger koek is a Dutch spice cake made with rye flour and mashed potatoes and flavored with molasses and spices like cloves, nutmeg, black pepper, cinnamon, cardemom and coriander.
This typical spice mix is also used in the Dutch pepernoten and speculatius.
Dutch heritage bread - Groninger koek
The dough of Groninger koek is made with Danko rye and freshly mashed potatoes. Other ingredients include eggs, kefir, molasses, sugar, salt, butter, baking soda, baking powder and a classic mixture of spices and optionally with candied orange peel.