Mmm pickled beetroot!
If you don't like the smell, when you're roasting the beetroot put a small splash of wine vinegar over the beetroot (a bit of a drizzle over the top, not enough to leave a puddle underneath) while they're in the oven. The wine vinegar, if it's a nice light one, will help mask the smell.
I would use about 3/4 - 1 litre of vinegar to a kilo of beetroot. If you like the lighter taste, a wine vinegar's good but can be really expensive. I would add about 20-50g sugar per kilo to the vinegar (but you don't have to). Boil the vinegar for about a minute or so with the sugar, plus if you're into it, you can add one of the following:
1. 2 whole chillies, cut from the tip to almost the stem 4 or 5 times around to effectively 'banana' them - then leave to cool for 2 hours after boiling, and remove the chillies
2. A muslin bag with 1 tbsp peppercorns, 5 cloves and a few coriander seeds - leave to cool for a couple of hours after boiling, remove the bag.
3. If you're going for the lighter taste, a splash or 2 of balsamic
Peel and slice beetroot, and stack in sterilised jars. Bring the vinegar back to the boil, then cover the beetroot and seal. It's ok to eat after a couple of weeks.
Hope that's ok - enjoy!