Avgolemono Soup - Greek soup that uses good broth, well beaten eggs and lemon juice... with or without shredded chicken, orzo (rice shaped pasta) or long grain rice.

simple to make and very satisfying, with a nice salad on the side.

I've even seen vegan versions online, though never tried them out so can't say how good they are.

I suspect you can use brown rice, though it will lose some of that creamy texture you get with white rice. you can even use bottled lemon juice if fresh lemons are not available - or in good shape at the market.