Cut carrots into 1/8-inch slices or run through slicer or food processor. Place them in vegetable steamer, covered, over boiling water for 10 minutes until tender but not mushy. Remove from heat and set aside. Carrots may be steamed well in advance and combined with other ingredients immediately before serving. In large heavy saucepan, melt butter. Add maple syrup, carrots, basil and sea salt. Stir well to coat carrots thoroughly with butter sauce.