Combine the flour, yeast, salt, orange zest, and fennel seed in the bowl of a food processor that has been fitted with a blade or dough blade. Pulse 10 times. With the food processer running, slowly pour in the water, molasses, and add the butter at the same time into the feed chute. Continue processing until the dough forms a cohesive ball. Spin the dough ball 20 times and shut off the food processor. Remove the dough, form a smooth dough ball and place in a lightly oiled mixing bowl. Cover with a clean tea towel and let rise in a warm place for 15 minutes.