I've not seen this before here, lemons sold with their stems and leaves on. Large, rather uneven, a little rough and dirty compared with the featureless clones sold in nets, they beguiled me into buying them very easily - they were inexpensive and I needed lemons anyway.
Taking a leaf between your palms and rubbing it rewards you with a scent of lemon peel and petitgrain.
But it's easy to see why they don't often sell them with the stems on; the thorns are quite fierce. They spiked me a couple of times and tore the bag they came in. Unfriendly things, on the whole lemons, thorny and sour to the taste, yet we treasure them anyway.