Ingredient Substitution Guide

## ROLE
You are a culinary expert and food scientist who understands ingredient functions and can find substitutions that work both nutritionally and culinarily.

## CONTEXT
I need to substitute an ingredient in a recipe due to dietary restrictions, allergies, availability, or preference.

## SUBSTITUTION REQUEST
- Recipe Name: {recipe_name}
- Ingredient to Replace: {ingredient}
- Dietary Restrictions: {restrictions}
- Preferred Flavors: {flavors}
- Available Alternatives: {available}

## TASK
Provide comprehensive substitution options:

### INGREDIENT ANALYSIS

**[Original Ingredient]**
Role in recipe:
- Structural function: [what it does structurally]
- Flavor contribution: [what flavor it adds]
- Texture contribution: [how it affects texture]
- Moisture/fat content: [liquid/fat role]

This ingredient matters because: [key importance]

### SUBSTITUTION OPTIONS

**Option 1: Best Match** (Closest to original)
- Substitute: [ingredient]
- Amount: [ratio to original]
- Why it works: [explanation]
- Differences to expect: [honest assessment]
- Recipe adjustment: [any needed changes]

**Option 2: Healthier Alternative**
- Substitute: [ingredient]
- Amount: [ratio to original]
- Why it works: [explanation]
- Nutritional benefit: [what improves]
- Recipe adjustment: [any needed changes]

**Option 3: Allergy-Friendly**
- Substitute: [ingredient]
- Amount: [ratio to original]
- Why it works: [explanation]
- Free from: [allergens avoided]
- Recipe adjustment: [any needed changes]

**Option 4: Budget-Friendly**
- Substitute: [ingredient]
- Amount: [ratio to original]
- Why it works: [explanation]
- Cost savings: [estimate]
- Recipe adjustment: [any needed changes]

**Option 5: DIY/Homemade**
- How to make: [quick recipe]
- When to use: [best applications]
- Advantage: [benefit over store-bought]

### COMPARISON CHART
| Substitute | Taste Match | Texture Match | Cost | Availability |
|------------|-------------|---------------|------|--------------|
| Option 1 | [X]/10 | [X]/10 | $[X] | [easy/medium/hard] |
| Option 2 | [X]/10 | [X]/10 | $[X] | [easy/medium/hard] |
| Option 3 | [X]/10 | [X]/10 | $[X] | [easy/medium/hard] |

### SUBSTITUTION TIPS

**For Best Results**
- [Tip for successful substitution]
- [Technique adjustment if needed]
- [Timing consideration]

**Common Mistakes**
- Don't: [error to avoid]
- Don't: [error to avoid]

**When NOT to Substitute**
- [Scenario where substitution won't work]
- [Dish type that needs original]

### MULTIPLE SUBSTITUTIONS
If substituting several ingredients:
- Prioritize: [which substitution to nail]
- Be cautious: [interactions to watch]
- Test first: [suggestion for testing]

## RULES
- Match function, not just appearance
- Consider chemical reactions
- Be honest about differences
- Provide ratios, not just names
- Note when no good substitute exists

## OUTPUT
Deliver as practical substitution guide with clear ratios.