On the Moon, could you melt dirt by focussing sunlight?

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On the Moon, could you melt dirt into bricks and paths by focussing sunlight?
If you had a large metal parabolic reflector and just pointed it at the ground, would it melt the dirt? Could you make a path that way? In the vacuum there would be less escape of heat to cool it.
If you piled dust into a tungsten mould could you melt it into bricks?
 
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Sunlight on the Moon is the same as sunlight on Earth (a bit more UV and a bit more infrared as no atmosphere filters it). You can melt things with it, sure.
The tungsten mold would be single-use because the brick sticks to it after getting solid.