- Preheat oven to 425°F (220°C). 
- Chop your cauliflower into small florets (no larger than 1 inch on any side), and place it into your mixing bowl. 
- Dice the onion and mince the garlic, and slide them on top of the cauliflower. 
- Measure out all the spices in a bowl, then the olive oil and lemon juice. Mix them all together in a separate small bowl, or simply pour them all on top of the cauliflower, onion, and garlic mixture. 
- Toss everything together in the bowl until each floret has been coated with a thin layer of oil, then arrange them in a single layer on the silicone mat (placed on top of your baking sheet). 
- Bake the mixture for 20 minutes, then take the tray out of the oven and use a spatula to move around the mixture. Rotate the tray to the other side, then bake for another 15 minutes. 
- DING! If it's done enough for you after 35 minutes, take it out now, but since I usually work with frozen cauliflower, at this point I move around the mixture one more time and bake for another 10 minutes to let it all crisp up even more. I like to eat most of mine off the pan initially, then tupperware the rest for the freezer, but I live alone so you do what you need to.