When dry and in a crumbly state it is harrowed and spread and finally ploughed in and mixed with the soil.
Feel free to add a little more flour if the dough feels too sticky, or add a little more water if the dough is too crumbly.
When your compost is black and earthy-smelling, with a soft, crumbly texture, it's ready to use.
Lentils can be dry, however, so make sure you add some liquid and an egg substitute to lentil burgers to avoid them being crumbly.
You definitely don't want to overmix the dough or it will end up crumbly.