In a stand mixer bowl, whisk together the sourdough discard, water, olive oil, sugar, and salt.
Mix in the flour and knead with the dough hook for 5-6 minutes until smooth and elastic.
Cover with plastic wrap and allow to rise in a warm place for 6-8 hours, or until doubled in size.
Line 2 large baking sheets with parchment paper.
Punch down the dough, then turn the dough onto a lightly floured surface. Roll into a log, and divide into 16 equal pieces.
Roll each piece into an 8-inch rope and tie into a loose knot. Place on the prepared baking sheets. Cover and let rise for another 45-60 minutes until noticeably puffed.
Combine the garlic topping ingredients in a small bowl. Brush over the knots, reserving some of the topping to brush on after they come out of the oven.
Bake at 400°F for 20-23 minutes until golden brown. Brush with more garlic butter, and sprinkle with parsley and parmesan.