D&D 5E Rules: Can you take a bonus action while casting a ritual spell?

[Esker]

The only situations I can think of where this would come up (since there's no hope of actually completing a ritual during a fight) are (a) you're attacked mid-ritual and don't want to start over, but you still have some things you can do to contribute (e.g., by directing your undead minions), or (b) out of combat, you want to do something with your minions (unseen servant, animated undead, etc.) during the 10m you are spending on the ritual.

 

[jmucchiello]

The funny thing is the reason I originally posted was purely for out of combat utility. Cast unseen servant. Direct the servant to remove all the rocks, pebbles and sticks within 10 feet. Start ritual casting Leomund's Tiny Hut. Now you not only have a nice safe place to rest but there aren't any annoying twigs or rocks inside it.