Preheat oven to 350°F / 180 °C. Line a 20 cm square baking pan parchment paper, or grease with butter, and set aside.
In a large mixing bowl or stand mixer, beat the eggs and sugar until well combined and fluffy. Add the carob molasses and beat again to combine, then add the melted butter and tahini and mix until smooth.
In a separate bowl, mix together the dry ingredients (flour, cocoa powder, baking powder and salt) and add to the carob & tahini mix. Beat until dry ingredients are thoroughly incorporated; if using a stand mixer or electric whisk, start at the lowest speed and increase once most of the flour mix is folded in. This stops the dry ingredients flying out of the mixing bowl!