Make your spice paste by either pounding the cumin, coriander, thyme, salt and peppers in a mortar and pestle until roughly ground, using an electric spice grinder (i.e. a coffee grinder you don’t mind smelling like spices) or small food processor to do the same, or, if using ground spices, just combining them in the bottom of the large bowl you’re about to use. In the bottom of a very large bowl, combine prepared spices, salt and pepper, garlic, vinegar and 1/4 cup olive oil and whisk to blend.