Prepare them as two batches and combine during fermentation. Divide the original recipe to make the percentage of lemon you want and devide the strawberry wine recipe to make the percentage of volume you want. If you have 2 gallons of strawberry wine and 3 gallons of lemon just use averages if 2 gal is 1.07 and 3 is 1.08 (long addition below)
5.38/5= 1.076 OG.
Assistant Winemaker/Cellar Manager
Inwood Estates Vineyards and Winery
1350 Manufacturing St. #209
Dallas, TX 75207