I add boiling water to my DME & yeast nutrient in the flask and whirl to dissolve. I simmer it on my backpacking stove for 15 minutes. 2 liter flasks cost too much to risk on stove elements or other hard surfaces.
Plunge it (gently) with oven baked foil krinkled on top into a cold water bath for 15 minutes. Pitch yeast and grow it. I use a rubber band to hold foil on and prevent critters (mice, cats, bugs) from finding their way into my starter wort. Whirl frequently and if time permits, settle yeast in refrigerator or cold cellar overnight so I can decant most of the spent wort before pitching. I sanitize with star san and no longer flame edges.
A 1.2 liter starter of XL Wyeast 1056 started pushing air through the airlock of a 1070 IPA this past weekend in under two hours. YMMV
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