Optimising the Base

Overview

Students trial and evaluate the foundational component of a hybrid dessert, such as a biscuit or pastry base. Working in kitchen teams, they use sensory evidence and simple testing to identify how a variable affects the base, then recommend an improvement for the next prototype.

Learning intentions

• WALT plan and carry out a fair practical trial of a dessert base.
• WALT apply food safety and safe kitchen practices.
• WALT collect sensory and process evidence to evaluate a prototype.
• WALT use evidence to suggest an improvement to the base.

Success criteria

• I can identify one variable to change and keep other important variables consistent.
• I can work safely and hygienically during practical food preparation.
• I can record accurate observations about texture, colour, flavour, shape and handling.
• I can explain whether my trial improved the base and justify my next step with evidence.

Curriculum links

• Technology: Technological Practice — planning, trialling and evaluating a technological outcome.
• Technology: Developing and evaluating an outcome against its intended purpose and agreed attributes.
• Technology: Managing resources, time, safety and practical procedures in a food technology context.
• Science: applying energy ideas to changes during cooking, including transformations and energy transfer in a closed system.

Lesson structure (60 minutes)

1. 0–5 min · Hook and purpose. Teacher displays two images or samples of contrasting biscuit/pastry bases and opens the comparison hook slide, asking, “Which base would best support our hybrid dessert, and what evidence would we need?” Students make an initial prediction and identify desirable attributes such as crispness, strength, flavour or appearance.

2. 5–12 min · Trial briefing and safety. Teacher uses the trial and safety slides to explain the practical challenge: each team will make the same base while changing one agreed factor, such as thickness, chilling time, shaping method or baking time. Review handwashing, hair tied back, oven and hot-tray procedures, allergen awareness, cross-contamination prevention and safe equipment use; distribute the risk assessment mini template for teams to identify hazards and controls. Students complete the key risk decisions, assign roles and check the success attributes on the base trial record.

3. 12–18 min · Planning the investigation. Teacher models a fair-test table on the fair trial planning slide, distinguishing the independent variable, controlled variables and observations to record. Students select one variable, write a prediction, allocate roles (equipment, ingredients, preparation, timing and recording), and confirm quantities and method before beginning.

4. 18–40 min · Practical trial. Teacher circulates, checks hygiene and safe technique, questions teams about their chosen variable, and manages oven access and timing. Students prepare, shape and cook the base, recording measurements, process changes and observations on the base trial record; while waiting, they complete the predicted outcome and note how heat may change the mixture’s texture, colour and structure.

5. 40–50 min · Evaluate and compare. Teacher signals clean-down, then uses the sensory evaluation and comparison slides to remind students to assess the base respectfully using agreed criteria rather than personal preference alone. Students inspect and, where appropriate, taste a cooled sample, record evidence for colour, texture, flavour, shape, strength and suitability for the hybrid dessert, then compare results with another team.

6. 50–57 min · Optimisation decision. Teacher models an evidence-based recommendation: “Because…, I would…, so that…”. Students complete the evaluation section of the base trial record, deciding whether to keep, modify or reject their variable and proposing one precise change for the next prototype.

7. 57–60 min · Plenary and exit check. Teacher returns to the final reflection slide and asks teams to share one useful finding. Students submit or photograph their worksheet and answer verbally or on the final line: “What evidence shows whether your base is fit for purpose, and what will you change next time?”

Resources

• One slide deck covering the hook, purpose, safety, fair testing, practical instructions, evaluation and plenary
• One-page base trial record worksheet for each student or team
• Ingredients and recipe for the selected biscuit or pastry base
• Kitchen equipment: scales, bowls, measuring tools, utensils, trays, baking paper and cooling racks
• Ovens, timers, heatproof gloves and serving equipment
• Aprons, hair ties or hairnets, handwashing supplies and sanitiser
• Allergen information and ingredient labels
• Risk assessment mini templates
• Cleaning cloths, detergent and waste containers

Assessment

• Check each team’s plan before preparation: one variable changed, controlled variables identified, prediction stated and roles allocated.
• Observe safe, hygienic and purposeful practical work; question students about how their chosen variable may affect the outcome.
• Use the completed trial record as formative evidence. Look for observations linked to agreed attributes and an improvement justified by evidence.

Differentiation

• Provide a worked example, visual process sequence, labelled equipment images and a word bank including crisp, crumbly, chewy, firm, fragile, golden, undercooked and over-browned.
• Offer sentence starters: “We changed…”, “We kept… the same”, “The evidence was…”, and “Next time we will… because…”.
• Use dyslexia-friendly worksheets and slides: clear sans-serif font, generous spacing, short instructions, high contrast, minimal text and icons alongside key steps. Read instructions aloud and allow speech-to-text or oral responses.
• Pair students strategically and assign meaningful roles. Provide teacher-selected variables and pre-measured ingredients for students needing reduced cognitive or motor load.
• Advanced learners can compare results across teams, consider more than one attribute when making their recommendation, and propose a follow-up trial that improves performance without compromising safety, cost or appearance.

Extension

• Develop a second prototype plan that changes a different variable while keeping the most successful conditions from today’s trial.
• Calculate the percentage of samples meeting the team’s agreed criteria and use this result to strengthen the evaluation.