get a double boiler and put the oil in the top and then the weed not sure about ratios but just keep the temps lowish, if the temps are too high youll burn the weed, then stir stir stir the longer you stir the better but between 1 and 2 hours is good, you can use regular cooking oil and the ratio is up to you. you should cut or grind up the herb

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"This bud of love, by summers ripening breath" Shakespeare