1In a large bowl, add cake mix, lemon juice, water, melted butter, eggs, and lemon zest, mix with a spoon until combined. Don't over mix, some lumps are fine.
Spray slow cooker with non-stick cooking spray
Pour batter in slow cooker, and smooth the batter down evenly
Cook on high for 1 1/2 to 2 hours. Check after 1 1/2 hours, press center of the cake with your fingers, should be firm.
If you aren't ready for dessert when time is up, just set to warm.
Mix Glaze ingredients in a small bowl with a spoon.
Pour over lemon cake
Scoop into bowls, and serve with vanilla ice cream