Choose substitute based on recipe type: peach jam or apricot preserves for glazing/baking; orange marmalade for savory cooking; honey-lemon or nectar mixes for dressings or sauces.
If using preserves, blend in a food processor for about 10 seconds to achieve smooth texture if needed.
Mix honey with lemon juice or peach nectar with cornstarch as applicable; cook peach nectar mix over medium heat while stirring until thickened (about 2 minutes).
Apply substitutes using a 1:1 ratio for jams and marmalade, ¾:1 for honey-lemon; adjust sweetness or tartness to taste.
Check final taste and consistency; for glazing, warm the substitute slightly if needed to loosen and achieve glossy finish.