Preheat your oven to 220°C (430°F) and position the rack in the middle. Gather your chopped root vegetables, garlic, lemon, olive oil, and seasonings.
Chop the vegetables into uniform 2-3 cm pieces; this helps them cook evenly and develop a beautiful caramelization.
In a mixing bowl, toss the chopped vegetables with olive oil, salt, and pepper until each piece is lightly coated and glistening.
Zest the lemon directly into the bowl to add a burst of citrus aroma, then halve and juice the lemon, pouring the bright juice over the veggies. Toss gently to evenly distribute the lemon zest and juice.
Spread the coated vegetables onto the baking sheet in a single layer, giving each piece space to caramelize and brown.
Roast in the oven for about 25-30 minutes, flipping the vegetables halfway through to promote even browning and caramelization.
About 10 minutes before the roasting is complete, sprinkle the crushed garlic over the vegetables to prevent burning and allow the aroma to develop as they finish roasting.
Once golden and tender with crispy edges, remove the vegetables from the oven and let them rest for a few minutes. The lemon glaze should be slightly thickened and glossy, coating each piece beautifully.
Finish with a final squeeze of fresh lemon juice for an extra punch of brightness, and serve warm, perhaps garnished with fresh herbs if desired.