How "red" is red? are you looking for like Blood Red?? or are you just wanting it to have no other color?
I know that you can use different grains that impart a red color
CaraAroma® (crystal malt) 130°-170° 1.034 Imparts a deep red color, adds body and malt aroma. For use in bocks, porters, stouts and ambers.
CaraRed® (crystal malt) 15°-20° 1.033 Provides body and a deep red color for use in red ales, lagers, Scottish ales and alts.
Crystal Malt 90° 1.033-1.035 Pronounced caramel flavor and a red color. For stouts, porters and black beers.
Crystal Malt 120° 1.033-1.035 Pronounced caramel flavor and a red color. For stouts, porters and black beers.
Crystal Malt 80° 1.033-1.035 Sweet, smooth caramel flavor and a red to deep red color. For porters, old ales.
Also Weyermann makes a Munich I and Munich II that impart red colors
Perhaps doing a nice mix of some of them and a base of Pale/Pils malt will get you want you need