Forum Sausage rolls

Generally you don't want to freeze and reheat any cooked pastry - the water crystals will build up in the air pockets that formed while cooking and then react with the fats in the pastry when reheated. You can do it, you may just wish you hadn't.

The best bet with pre-preparing pastry items is to freeze the prepared but uncooked item, then cook it in an oven before serving. Obviously you may not have access to an oven at work however.

You could therefor cook them a day or three in advance, chill them in the fridge and then reheat in a microwave or similar if you really wanted to. Try a dense pastry rather than flaky if reheating - it won't collapse as much the way flaky does. It will still be a bit chewier than had you cooked it immediately before serving. 

Also, seeing as these may be meat based sausage rolls make sure you know how long you can keep the product chilled after cooking and maybe invest in an icepack for your lunch box for transit. Cooked pastry can happily keep for up to a week in the fridge but the actual duration will depend on your filling in most cases.

If you want something that you can cook in advance, freeze, transport and then reheat maybe try a burrito style recipe. Tortillas will be much more forgiving about freezing than pastry.