Heat water in a deep non stick pan, add potatoes and salt and cook till the potatoes are completely done. Drain ½ the corn kernels.
Heat 1 tbsp oil in a non stick grill pan, add garlic cloves and grill for a few minutes.Add the drained corn kernels to the same pan and spread. Sprinkle salt over them and grill till lightly burnt. Strain the potatoes in a colander.
Put garlic cloves in a blender jar. Drain the remaining corn kernels and put into the blender jar and crush. Heat 2 tbsps butter in a non stick pan, add the potatoes and mash with a masher. Add the crushed garlic and corn and mix well.
Add fresh cream and mix well. Adjust salt. Add the remaining butter and mix. Transfer the potatoes into a serving bowl. Sprinkle the grilled corn over them and serve immediately.